Application of 16034-46-1, Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 16034-46-1, name is 1-Methyl-1H-pyrazole-5-carboxylic acid, This compound has unique chemical properties. The synthetic route is as follows.
To a solution of 1-methyl-1H-pyrazole-5-carboxylic acid (compound 4A, 1.99 g, 15.8 mmol), DIEA (5.95 g, 46.0 mmol) in CH2Cl2 (20 mL) was added EDCI (5.04 g, 26.3 mmol) and DMAP (1.93 g, 15.8 mmol) at -5 C., the mixture was stirred at -5 C. for 30 min under N2. Then 2-methyl-4-nitroaniline (compound 15, 2.00 g, 13.1 mmol) was added, the mixture was stirred at -5 C. for 30 min, then warmed to 25 C., stirred for 11 hrs. TLC (petroleum ether:ethyl acetate=1:1, Rf=0.55) showed starting material consumed completely. The mixture was concentrated in vacuum to give light yellow oil. The oil was purified by silica gel column chromatograph (petroleum ether:ethyl acetate=100:0 to 50:50) to give 1-methyl-N-(2-methyl-4-nitrophenyl)-1H-pyrazole-5-carboxamide (compound 16, 2.60 g, 76% yield) as light yellow solid.
The chemical industry reduces the impact on the environment during synthesis 1-Methyl-1H-pyrazole-5-carboxylic acid. I believe this compound will play a more active role in future production and life.
Reference:
Patent; Kyn Therapeutics; Castro, Alfredo C.; Evans, Catherine Anne; (108 pag.)US2019/55218; (2019); A1;,
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