thiocarbamates has been designed to construct bridged seven-membered-ring systems that are otherwise challenging to prepare. Taking advantage of this newly developed method, enantioselective syntheses of lyconadins A-E (1-5), lycopecurine (6), and dehydrolycopecurine (7) have been realized in a divergent fashion. Our synthetic strategy also features an intramolecular cyclization of a N-chloroamine to forge the
一种新型的
钯催化的
硫代
氨基甲酸酯的Heck型反应已被设计来构建桥接的七元环系统,否则该系统难以制备。利用这种新开发的方法,已经以不同的方式实现了对豆蔻精AE(1-5),lycopecurine(6)和dehydrolycococurine(7)的对映选择性合成。我们的合成策略还包括N-
氯胺的分子内环化以形成C6-N键,环状硝酮的环安式Mannich型反应将C4和C13缝合在一起以及环缩合以提供(二氢-)
吡啶酮主题。