反应详情

49.3 mg of 2,3,5,10,11,11a-hexahydro-9-hydroxy-11-methoxy-8-methyl-1H-pyrrolo(2,1-C)(1,4)benzodiazepin-5-one was suspended in 0.5 ml of 1:1 mixture of triethylamine and acetic anhydride and stirred at 0° to 5° C. for 15 minutes under a stream of nitrogen gas. Thus, 30 mg of 2,3,5,10,11,11a-hexahydro-9-acetoxy-11-methoxy-8-methyl-1H-pyrrolo(2,1-C)(1,4)benzodiazepin-5-one was obtained was a colorless powdery product. Recrystallization of the resulting product from acetone-ligroin gave a colorless needle-like crystal having a melting point of 147° to 149.5° C.