The asymmetric formal synthesis of schulzeines A and C is described. Key features of the synthesis include the efficient and stereoselective construction of the benzoquinolizidine skeleton via the aza-Claisen rearrangement-induced ring expansion of the 1-vinyl-N-glycyl-isoquinoline, which was prepared by the highly enantioselective asymmetric allylation of the 8-benzyloxy-substituted dihydroisoquinoline and by the acid-catalyzed transannulation of the resulting 10-membered lactam.
描述了舒尔泽因A和C的不对称形式合成。合成的关键特征包括通过氮-Claisen重排诱导的环扩展有效且立体选择性地构建苯并
喹啉啶骨架,该反应是通过对8-苄氧取代的二氢
喹啉进行高选择性的非对称烯丙基化以及对所得10元内酯进行酸催化的环转化反应得到的。