Studies on diazepines. XX. Acylations of 1H-1,2-thienodiazepines and 1H-1,2-benzodiazepines.
作者:JYOJI KURITA、MICHIKO ENKAKU、TAKASHI TSUCHIYA
DOI:10.1248/cpb.31.3684
日期:——
Treatment of the N-unsubstituted 3-methyl-1H-1, 2-thieno[2, 3-c]diazepine (3) with ethyl chloroformate, acetyl chloride, or benzoyl chloride in benzene resulted in ring-conversion to give the corresponding 3-acyl-3H-1, 3-thieno[2, 3-d]diazepines (4), whereas similar treatment of the N-substituted thieno[2, 3-c]diazepine (6) gave the exo-methylene compound (7) and treatment of the fully unsubstituted thieno[2, 3-c]diazepine (8) gave the thieno[2, 3-b]pyridine derivatives (9) and (10). On the other hand, the N-unsubstituted 3-methyl-1H-1, 2-benzo[c]diazepines (16), upon treatment with ethyl chloroformate in benzene, gave the exo-methylene compounds (17), and in the case of the diazepines (16b, c) having an electron-donating group in the 7-position, the 3-acyl-3H-1, 3-benzo[d]diazepines (19) were also formed. The mechanisms of these acylations are discussed.
在苯中用氯甲酸乙酯、乙酰氯或苯甲酰氯处理 N-未取代的 3-甲基-1H-1, 2-噻吩并[2, 3-c]二氮杂卓 (3) 会发生环转化,得到相应的 3-酰基-3H-1, 3-噻吩并[2, 3-d]二氮杂卓 (4)、而对 N-取代的噻吩并[2,3-c]二氮杂卓(6)进行类似处理,可得到外亚甲基化合物(7);对完全未取代的噻吩并[2,3-c]二氮杂卓(8)进行处理,可得到噻吩并[2,3-b]吡啶衍生物(9)和(10)。另一方面,N-未取代的 3-甲基-1H-1, 2-苯并[c]二氮杂卓(16)在苯中经氯甲酸乙酯处理后,生成外亚甲基化合物(17),而在 7 位上有一个电子供能基团的二氮杂卓(16b、c)还生成了 3-酰基-3H-1, 3-苯并[d]二氮杂卓(19)。本文讨论了这些酰化反应的机理。