Electric Literature of 3920-50-1, The chemical industry reduces the impact on the environment during synthesis 3920-50-1, name is Pyrazole-3-carboxaldehyde, I believe this compound will play a more active role in future production and life.
The compound (72.0 mg) obtained in Example 43-1 was dissolved in methanol (3.5 ml) and then added with pyrazole-3-carboxaldehyde (24.5 mg) and sodium cyanoborohydride (35.9 mg). The reaction solution was adjusted to pH 5 with the addition of acetic acid, followed by stirring at room temperature for 14 hours. The reaction solution was added with a 1 mol/l sodium hydroxide aqueous solution and then extracted with chloroform. Then, the organic layer was washed with saturated saline solution and dried with anhydrous sodium sulfate. After the solvent had been distilled off, the residue obtained was purified through silica gel column chromatography (chloroform/ethyl acetate) and treated with hydrochloric acid, thereby obtaining hydrochloride (52.3 mg) of the subject compound as a yellow solid. MS(FAB,Pos.):m/z=486[M+H]+1H-NMR(500MHz,DMSO-d6):delta=0.85(6H,t,J=7.5Hz),1.65(4H,m),2.88(4H,m),3.70(2H,brs),3 .78(2H,brs),4.00(2H,brs),4.10(2H,brs),4.28(2H,brs),6.34(1H,d ,J=2.1Hz),6.65(2H,d,J=8.5Hz),7.21(2H,d,J=8.5Hz),7.32(2H,d,J= 8.3Hz),7.38(2H,d,J=8.3Hz),7.51(2H,s),7.69(1H,d,J=2.1Hz).
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, Pyrazole-3-carboxaldehyde, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; Kureha Chemical Industry Co., Ltd.; EP1550657; (2005); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics