Category: 37622-90-5

Pyrazoles and pyrimidines have diverse biological and pharmacological activities. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. There are a number of antimicrobial compounds containing pyrazole moiety as the core unit. Recommanded Product: Ethyl 4-pyrazolecarboxylate.

Gimeno-Fonquernie, Pol;Liang, Weibin;Albalad, Jorge;Kuznicki, Andrew;Price, Jason R.;Bloch, Eric D.;Doonan, Christian J.;Sumby, Christopher J. research published 《 Templated synthesis of zirconium(IV)-based metal-organic layers (MOLs) with accessible chelating sites》, the research content is summarized as follows. Metal-organic layers (MOLs) are of great interest in heterogeneous catalysis, particularly materials that can accommodate extraneous metal centers. Here, the authors demonstrate a two-step preorganisation/delamination synthetic strategy using CuI as a template to prepare Zr-based MOLs with accessible ‘syn’ bis-pyrazolyl chelating sites (named UAM-2·ns) that are poised for quant. post-synthetic metalation with late transition metals.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Recommanded Product: Ethyl 4-pyrazolecarboxylate

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole and its derivatives are considered a pharmacologically important active scaffold that possesses almost all types of pharmacological activities. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazole is a weak base, with pKb 11.5 (pKa of the conjugated acid 2.49 at 25 °C).Pyrazole used as a ligand to prepare organometallic compounds. Product Details of C6H8N2O2.

Goi, Takashi;Nakajima, Tatsuo;Komatsu, Yoshiyuki;Kawata, Atsushi;Yamakoshi, Shuhei;Okada, Okimasa;Sugahara, Masakatsu;Umeda, Asami;Takada, Yoko;Murakami, Jun;Ohashi, Rikiya;Watanabe, Tomoko;Fukase, Koichi research published 《 Pyrazolo[4,3-d]pyrimidine Derivatives as a Novel Hypoxia-Inducible Factor Prolyl Hydroxylase Domain Inhibitor for the Treatment of Anemia》, the research content is summarized as follows. Inhibition of hypoxia-inducible factor prolyl hydroxylase domain (HIF-PHD) promotes erythropoietin (EPO) production by stabilizing the HIFα subunit. Thieno[2,3-d]pyrimidine 8 identified based on X-ray crystal structure anal. was optimized to lead to the discovery of pyrazolo[4,3-d]pyrimidine 13 as the lead compound of orally bioavailable HIF-PHD inhibitors. Conversion of the benzyl moiety in 13 gave pyrazolopyrimidine 19(I) with high solubility and bioavailability, which increased Hb levels in anemic model rats after repeated oral administration. It was shown that pyrazolo[4,3-d]pyrimidine derivatives are promising therapeutic agents for renal anemia through the inhibition of HIF-PHD.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Product Details of C6H8N2O2

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazoles can be selectively lithiated at different carbons and subsequently react with electrophiles depending on the substitution patterns. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. 1-Methyl-5-(trifluoromethyl)pyrazole underwent deprotonation and subsequent carboxylation mainly or exclusively at either the 4-position of the heterocycle or at the nitrogen-attached methyl group. Related Products of 37622-90-5.

Goi, Takashi;Matsudaira, Tetsuji;Fukase, Koichi research published 《 Practical synthesis of 1-substituted 5-aminopyrazolo[4,3-d]pyrimidin-7-ones using intramolecular friedel-crafts type cyclization and its application to the synthesis of pharmaceutically active compounds》, the research content is summarized as follows. Intramol. Friedel-Crafts type cyclization is known as an efficient method of synthesizing fused bicyclic pyrimidones. However, the synthesis of 1-substituted pyrazolo[4,3-d]pyrimidin-7-ones using this cyclization method has not been achieved. Herein, authors describe the synthesis of various 1-substituted pyrazolo[4,3-d]pyrimidin-7-ones using practical intramol. Friedel-Crafts type cyclization, which was carried out in N,N-dimethylformamide in the presence of chlorotrimethylsilane. A hypoxia-inducible factor prolyl hydroxylase domain (HIF-PHD) inhibitor I was efficiently synthesized by this method.

Related Products of 37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, 37622-90-5.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole and its derivatives are considered a pharmacologically important active scaffold that possesses almost all types of pharmacological activities. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazole is a weak base, with pKb 11.5 (pKa of the conjugated acid 2.49 at 25 °C).Pyrazole used as a ligand to prepare organometallic compounds. Category: pyrazoles-derivatives.

Goi, Takashi;Fukase, Koichi research published 《 Highly Efficient Coupling of Unstable Bicyclic Pyrimidines and Pyrazoles under Basic Conditions, and its Application to the Synthesis of Pharmaceutical Compounds》, the research content is summarized as follows. The efficient Pd-catalyzed coupling of unstable bicyclic pyrimidines and pyrazoles under basic conditions was established for the first time. The reactions proceeded with excellent yields without hydrolysis using Pd₂(dba)₃, ^tBuXPhos, and K₃PO₄.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Category: pyrazoles-derivatives

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole and its derivatives are considered a pharmacologically important active scaffold that possesses almost all types of pharmacological activities. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazole is a weak base, with pKb 11.5 (pKa of the conjugated acid 2.49 at 25 °C).Pyrazole used as a ligand to prepare organometallic compounds. COA of Formula: C6H8N2O2.

Grosso, Carla;Lemos, Americo;Pinho e Melo, Teresa M. V. D. research published 《 Conjugate Addition of Pyrazoles to Halogenated Nitroso- and Azoalkenes: A New Entry to Novel Bis(pyrazol-1-yl)methanes》, the research content is summarized as follows. A new and versatile synthetic approach towards bis(pyrazolyl)methanes I [R = C₆H₄Br-4, C₆H₄Cl-4, Me], based on 1,4-addition of pyrazoles to conjugated α-halogenated nitroso- and azoalkenes, is described. Tris(pyrazolyl)methanes , e.g., II, can also be obtained by this methodol.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, COA of Formula: C6H8N2O2

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole and its derivatives are considered a pharmacologically important active scaffold that possesses almost all types of pharmacological activities. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazole is a weak base, with pKb 11.5 (pKa of the conjugated acid 2.49 at 25 °C).Pyrazole used as a ligand to prepare organometallic compounds. Recommanded Product: Ethyl 4-pyrazolecarboxylate.

Gu, GuoLiang;Zhou, TaiYan research published 《 Effective route for synthesis of novel aromatic pyridine derivates with polyamino polycarboxyl units》, the research content is summarized as follows. A series of novel aromatic mols. with polyamino polycarboxyl were designed, synthesized and characterized in detail based on elemental anal., IR, mass, proton NMR spectroscopy. The synthetic route was optimized. The yield of second synthesis step over 91 % as a result of the catalyst (LiBr) used. Due to the fascinating structure with multiple N and O donor atoms, it may be potential applications in organic light emitting diodes (OLED).

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Recommanded Product: Ethyl 4-pyrazolecarboxylate

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazoles can be selectively lithiated at different carbons and subsequently react with electrophiles depending on the substitution patterns. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. 1-Methyl-5-(trifluoromethyl)pyrazole underwent deprotonation and subsequent carboxylation mainly or exclusively at either the 4-position of the heterocycle or at the nitrogen-attached methyl group. Reference of 37622-90-5.

Guan, Jinming;Spry, Christina;Tjhin, Erick T.;Yang, Penghui;Kittikool, Tanakorn;Howieson, Vanessa M.;Ling, Harriet;Starrs, Lora;Duncan, Dustin;Burgio, Gaetan;Saliba, Kevin J.;Auclair, Karine research published 《 Exploring Heteroaromatic Rings as a Replacement for the Labile Amide of Antiplasmodial Pantothenamides》, the research content is summarized as follows. Malaria-causing Plasmodium parasites are developing resistance to antimalarial drugs, providing the impetus for new antiplasmodials. Although pantothenamides show potent antiplasmodial activity, hydrolysis by pantetheinases/vanins present in blood rapidly inactivates them. We herein report the facile synthesis and biol. activity of a small library of pantothenamide analogs in which the labile amide group is replaced with a heteroaromatic ring. Several of these analogs display nanomolar antiplasmodial activity against Plasmodium falciparum and/or Plasmodium knowlesi, and are stable in the presence of pantetheinase. Both a known triazole and a novel isoxazole derivative were further characterized and found to possess high selectivity indexes, medium or high Caco-2 permeability, and medium or low microsomal clearance in vitro. Although they fail to suppress Plasmodium berghei proliferation in vivo, the pharmacokinetic and contact time data presented provide a benchmark for the compound profile likely required to achieve antiplasmodial activity in mice and should facilitate lead optimization.

Reference of 37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, 37622-90-5.

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazoles can be selectively lithiated at different carbons and subsequently react with electrophiles depending on the substitution patterns. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. 1-Methyl-5-(trifluoromethyl)pyrazole underwent deprotonation and subsequent carboxylation mainly or exclusively at either the 4-position of the heterocycle or at the nitrogen-attached methyl group. SDS of cas: 37622-90-5.

Guan, Zhipeng;Zhu, Shuxiang;Yang, Yankai;Liu, Yanlong;Wang, Siyuan;Bu, Faxiang;Cong, Hengjiang;Alhumade, Hesham;Zhang, Heng;Lei, Aiwen research published 《 Electrochemically selective double C(sp²)-X (X = S/Se, N) bond formation of isocyanides》, the research content is summarized as follows. The current study demonstrates the C(sp²)-S/Se and C(sp²)-N bond formation of one carbon of isocyanides RNC (R = t-Bu, cyclohexyl, 2,6-dimethylphenyl, etc.) with thiophenols R¹SH (R¹ = Ph, 2-methoxyphenyl, 3-bromophenyl, etc.) or disulfides or diselenides R²XXR² (R² = Me, cyclopentyl, benzyl, etc.; X = S, Se) and azazoles R³H (R³ = 1H-benzo[d][1,2,3]triazol-1-yl, 1H-pyrazol-1-yl, 1H-tetrazol-1-yl, etc.) simultaneously. The reported findings could provide access to novel multiple isothioureas RN=C(SR¹/R²)(R³), especially hitherto rarely reported selenoureas RN=C(SeR²)(R³). The protocol showed good atom-economy and step-economy with only hydrogen evolution and theor. calculations accounted for the stereoselectivity of the products. Importantly, the electrochem. reaction could exclusively occur at the isocyano part regardless of the presence of susceptible radical acceptors, such as a broad range of arenes and alkynyl moieties, even alkenyl moieties.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, SDS of cas: 37622-90-5

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole is an organic compound with the formula C3H3N2H. It is a heterocycle characterized by a 5-membered ring of three carbon atoms and two adjacent nitrogen atoms, which are in ortho-substitution. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazoles are a class of compounds that have the ring C3N2 with adjacent nitrogen atoms.Notable drugs containing a pyrazole ring are celecoxib (celebrex) and the anabolic steroid stanozolol. Application In Synthesis of 37622-90-5.

Fauber, Benjamin P.;Dragovich, Peter S.;Chen, Jinhua;Corson, Laura B.;Ding, Charles Z.;Eigenbrot, Charles;Giannetti, Anthony M.;Hunsaker, Thomas;Labadie, Sharada;Liu, Yichin;Liu, Yingchun;Malek, Shiva;Peterson, David;Pitts, Keith;Sideris, Steve;Ultsch, Mark;VanderPorten, Erica;Wang, Jing;Wei, BinQing;Yen, Ivana;Yue, Qin research published 《 Identification of 2-amino-5-aryl-pyrazines as inhibitors of human lactate dehydrogenase》, the research content is summarized as follows. A 2-amino-5-aryl-pyrazine, e.g. I [R = 2-O₂CC₆H₄, 3-O₂CC₆H₄, 4-O₂CC₆H₄, etc.] was identified as an inhibitor of human lactate dehydrogenase A (LDHA) via a biochem. screening campaign. Biochem. and biophys. experiments demonstrated that the compound specifically interacted with human LDHA. Structural variation of the screening hit resulted in improvements in LDHA biochem. inhibition and pharmacokinetic properties. A crystal structure of an improved compound bound to human LDHA was also obtained and it explained many of the observed structure-activity relationships.

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Application In Synthesis of 37622-90-5

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Pyrazole is an organic compound with the formula C3H3N2H. It is a heterocycle characterized by a 5-membered ring of three carbon atoms and two adjacent nitrogen atoms, which are in ortho-substitution. 37622-90-5, formula is C6H8N2O2, Name is Ethyl 4-pyrazolecarboxylate. Pyrazoles are a class of compounds that have the ring C3N2 with adjacent nitrogen atoms.Notable drugs containing a pyrazole ring are celecoxib (celebrex) and the anabolic steroid stanozolol. Electric Literature of 37622-90-5.

Fernandes, Celia;Maria, Leonor;Gano, Lurdes;Santos, Isabel C.;Santos, Isabel;Paulo, Antonio research published 《 Re(I) and ^99mTc(I) tricarbonyl complexes with ether-containing pyrazolyl-based chelators: Chemistry, biodistribution and metabolism》, the research content is summarized as follows. Tris(pyrazolyl)methane chelators, L1-L3, containing one or two ether groups at different positions of the azole rings, were synthesized and fully characterized. These chelators enabled the synthesis of fac-[^99mTc(CO)₃{HC[4-(ROCH₂)pz]₃}]⁺ (R = Me (Tc1), Et (Tc2)) and fac-[^99mTc(CO)₃{HC[3,5-(EtOCH₂)₂pz]₃}]⁺ (Tc3) which were identified by HPLC in comparison with the rhenium counterparts. The evaluation of Tc1-Tc3 in CD-1 mice showed that the number and/or nature of the ether groups greatly influence the biodistribution profile, pharmacokinetics and metabolic stability of these complexes. Tc1 and Tc2, bearing a unique ether substituent at the 4-position of the pyrazolyl ring, undergo metabolic transformation in vivo while Tc3 is not metabolized. The metabolization of Tc1 and Tc2 enhanced their rate of excretion but, most probably, also justify their negligible heart uptake in contrast with the high heart uptake of congener non-metabolizable complexes (^99mTc-DMEOP and ^99mTc-TMEOP), which have recently emerged as potential myocardial imaging agents. The attempts made to identify the metabolites of Tc1 and Tc2 showed that the metabolization of these compounds must involve the ether functions with probable formation of carboxylic acid derivatives A comparative study with the congener fac-[^99mTc(CO)₃{[4-(MeOCH₂)pz](CH₂)₂NH(CH₂)₂NH₂}]⁺ (Tc6) led the authors to confirm the formation of such type of metabolites. In fact, Tc6 is also metabolized in mice with formation of fac-[^99mTc(CO)₃{[4-(HOCH₂)pz](CH₂)₂NH(CH₂)₂NH₂}]⁺ (Tc7) and fac-[^99mTc(CO)₃{[4-(HOOC)pz](CH₂)₂NH(CH₂)₂NH₂}]⁺ (Tc8), which were chem. identified by HPLC in comparison with the Re congeners (Re7 and Re8).

37622-90-5, Ethyl 4-pyrazolecarboxylate, also known as Ethyl pyrazole-4-carboxylate, is a useful research compound. Its molecular formula is C6H8N2O2 and its molecular weight is 140.14 g/mol. The purity is usually 95%.

Ethyl pyrazole-4-carboxylate is a low yield, transition metal salt that is used in the synthesis of pyrazoles. It can be synthesized by the reaction of sodium ethoxide with ethyl chloroformate and a Grignard reagent. Sodium ethoxide is added to a suspension of sodium chloride and dried ethyl chloroformate, followed by addition of magnesium turnings. The mixture is refluxed for one hour, cooled, and filtered to give crystals. Ethyl pyrazole-4-carboxylate is used in the preparation of ethyl esters from aliphatic alcohols by reacting with boron trichloride or phosphorus pentachloride. It participates in certain chemical reactions as a byproduct and can damage equipment during chemical reactions. The yield of this compound can be increased by using an excess amount of Grignard reagent or adding hexamethylenetetramine to the reaction mixture, Electric Literature of 37622-90-5

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics