amides have stable planar chirality at ambient temperature. The transformation of the enantiomerically enriched amides provides opticallyactive compounds containing stereogenic centers in a stereospecific fashion. As a demonstration of the synthetic utility of the amides, we have synthesized (+)-γ-lycorane using such an opticallyactive amide as a chiral building block.
Palladium-catalyzed intramolecular tandem cyclization reactions were conducted for the synthesis of densely cis/cis-fused aza-tetracyclic structures. The process involved a palladium(II)-catalyzed aerobic aza-Wacker reaction, followed by a palladium(0)-catalyzed Heckreaction. The effects of the solvent and benzene substitution pattern on the one-pot, two-step cascade reaction were studied systematically
进行了钯催化的分子内串联环化反应,以合成致密的顺式/顺式稠合的氮杂四环结构。该过程涉及钯(II)催化的好氧aza-Wacker反应,然后是钯(0)催化的Heck反应。系统地研究了溶剂和苯的取代方式对一锅两步级联反应的影响,并提出了可能的机理。使用钯催化的aza-Wacker-Heck环化反应,也可以快速合成应变的五氢苯并[ f ]环戊基[ hi ]吲哚并嗪-6-和外消旋的γ-二十烷。
Synthesis of (.+-.)-.alpha.- and (.+-.)-.gamma.-lycorane via a stereocontrolled organopalladium route
作者:Jan E. Baeckvall、Pher G. Andersson、Guy B. Stone、Adolf Gogoll