作者:J.F. Stambach、L. Jung
DOI:10.1016/s0040-4020(01)83481-5
日期:1985.1
A novel synthesis of the berbine ring skeleton by the way of the berbin-8-ones is reported. Treatment of 1-benzyl-1,2,3,4-tetrahydroisoquinolines 1a-d with phosgene gas gave a new series of N-chloroformyl derivatives 2a-d. Intramolecular ring closure of these compounds in presence of a Lewis acid catalyst afforded berbin-8-ones 3a-d in good yield. The choice of the cyclization catalyst is discussed
据报道,通过berbin-8-ones可以合成一种新的贝宾环骨架。用光气处理1-苄基-1,2,3,4-四氢异喹啉1a-d,得到一系列新的N-氯甲酰基衍生物2a-d。在路易斯酸催化剂的存在下,这些化合物的分子内闭环以良好的产率提供了berbin-8-ones 3a-d。讨论了环化催化剂的选择。用氢化锂铝还原产物3a-d得到了小bin碱4a-d。水解小bin 4b,c生成新的3-羟基小hydroxy 4e,f。制备新的起始苄基四氢异喹啉描述图1b,c。