Application of 1904-31-0,Some common heterocyclic compound, 1904-31-0, name is 1-Methyl-1H-pyrazol-3-amine, molecular formula is C4H7N3, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
General procedure: To a solution of benzoic acid which was obtained by hydrolysis of methyl esters 8 or 12A-E (0.22 mmol, 1.0 equiv), aminothiazole or imidazo[1,2-a]pyrazin-8-amine or aminopyrazole (0.33 mmol, 1.5 equiv), HATU (0.33 mmol, 1.5 equiv) and HOAt (0.33 mmol, 1.5 equiv) in DMF (2 mL) was added dropwise di(isopropyl)ethylamine (DIPEA) (0.12 mL, 0.67 mmol, 3 equiv). The reaction was run under microwave at 60 ¡ãC (40 W) for 30 min, and then cooled to room temperature and poured into brine. The aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried over anhydrous NaSO4 and concentrated. The residue was purified by chromatography (SiO2, petroleum ether/EtOAc = 4:1-1:1) to yield corresponding amides as white or yellow powder.
The synthetic route of 1904-31-0 has been constantly updated, and we look forward to future research findings.