Reference of 345637-71-0, A common heterocyclic compound, 345637-71-0, name is 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetic acid, molecular formula is C7H7F3N2O2, its 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.
Step A: Preparation of 5-methyl-3-(trifluoromethyl)-lH-pyrazole-l -acetyl chloride A mixture of 5-methyl-3-(trifluoromethyl)-lH-pyrazole-l -acetic acid (5.2 g, 25 mmol) in dichloromethane (70 mL) and N,N-dimethylformamide (2 drops) was cooled to 0 C and oxalyl chloride (4.76 g, 37.5 mmol) in dichloromethane (10 mL) was added dropwise. The reaction mixture was stirred at room temperature for 16 h, and then concentrated under reduced pressure to give the title compound as a slightly yellowish solid (5.64 g). H NMR (CDC13): delta 6.38 (s, 1H), 5.27 (s, 2H), 2.31 (s, 3H).
The synthetic route of 345637-71-0 has been constantly updated, and we look forward to future research findings.