反应详情

8-Methyl-3-trifluoromethyl-5,6-dihydro-8H-imidazo[1,5-a]pyrazine-1,7-dicarboxylic acid 7-tert-butyl ester 1-methyl ester 39b (0.35 g, 0.96 mmol) was added into the reaction flask. A solution of 2.3 N hydrochloric acid in 10 mL of ethyl acetate was then added to the flask. The reaction mixture was stirred at room temperature for 2 hours and monitored by thin layer chromatography until the disappearance of the starting materials. The reaction mixture was concentrated under reduced pressure to obtain the title compound 8-methyl-3-trifluoromethyl-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid methyl ester hydrochloride 39c crude product (0.4 g) as a yellow oil.

1. concentrationThe reaction mixture was concentrated under reduced pressure