Preparation method of 8-tert-butyl-1-ethyl-6,7-dihydro-5H-imidazo[1,5-a][1,4]diazepine-1,8(9H)-dicarboxylic acid ester
A dicarboxylate, diazepine technology applied in 8-tert-butyl-1-ethyl-6,7-dihydro-5H-imidazo[1,5-a][1,4] In the field of diazepine-1,8(9H)-dicarboxylate production method, it can solve the problems of no suitable industrial synthesis method, and achieve the effects of short synthesis route, easy reaction and convenient operation
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[0010] Example 1: a. Combine compound 5A_2 (212 g, 2.0 mol) and TsOH . H 2 O (5.7 g, 0.03 mol) was dissolved in toluene (1.5 L), 5A_1 (195 g, 2.6 mol) was added, the reaction solution was heated to reflux, and the reaction was continued for 16 hours. The reaction system was cooled to room temperature and distilled under reduced pressure to obtain a colorless oily compound 5A_3 (400 g), which was directly used in the next reaction.
[0011] b. Dissolve the crude compound 5A_3 (400 g) in ethanol (1.8 L), and add sodium borohydride (114 g, 3.0 mol) at 0°C. The reaction was controlled at room temperature (20-30°C) to continue the reaction for 17 hours. It was quenched by adding water, the reaction solution was distilled under reduced pressure to remove ethanol, and the residue was extracted with ethyl acetate (1000 mL x 3). The combined organic phase was washed with saturated sodium carbonate, the organic phase was dried over sodium sulfate, filtered and concentrated by distillation...
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