《Ligand-controlled Regiodivergent C-H Alkenylation of Pyrazoles and its Application to the Synthesis of Indazoles》 was published in Angewandte Chemie, International Edition in 2017. These research results belong to Kim, Hyun Tae; Ha, Hyeri; Kang, Geunhee; Kim, Og Soon; Ryu, Ho; Biswas, Abul Kalam; Lim, Sang Min; Baik, Mu-Hyun; Joo, Jung Min. HPLC of Formula: 52096-24-9 The article mentions the following:
Regioselective C4-, C5-, and di-alkenylations of pyrazoles were achieved. An electrophilic Pd catalyst generated by trifluoroacetic acid (TFA) and 4,5-diazafluoren-9-one (DAF) leads to C4-alkenylation, whereas KOAc and mono-protected amino acid (MPAA) ligand Ac-Val-OH give C5-alkenylation. A combination of palladium acetate, silver carbonate, and pivalic acid affords dialkenylation products. Annulation through sequential alkenylation, thermal 6π-electrocyclization, and oxidation gives functionalized indazoles. This comprehensive strategy greatly expands the range of readily accessible pyrazole and indazole derivatives, enabling useful regiodivergent C-H functionalization of pyrazoles and other heteroaromatic systems. After reading the article, we found that the author used 1-Butyl-1H-pyrazole(cas: 52096-24-9HPLC of Formula: 52096-24-9)
1-Butyl-1H-pyrazole(cas: 52096-24-9) belongs to pyrazoles. Pyrazole derivatives have been reported to exhibit a wide range of applications in medicinal chemistry and pharmacology. A large number of drugs incorporating pyrazole structure have been utilized as partial agonists for nicotinic acid receptors, antidepressants, antimicrobial agents, antiviral agents, and antifungal agents solely or along with the combination of other structural motifs.HPLC of Formula: 52096-24-9
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics