as the chiralauxiliary, both trans - and cis -annelated decahydroquinoline alkaloids can be synthesized stereoselectively. This methodology of asymmetric synthesis is based on the effect that both enantiomers of 2,6-disubstituted piperidin-4-ones are selectively and alternatively accessible using the auxiliary as the identical stereodifferentiating tool. In addition, the carbohydrate auxiliary controls
使用四-O-新戊酰β- d -galactopyranosylamine作为手性助剂,既 反式 -和 顺 -annelated十氢喹啉生物碱可立体选择性地合成。这种不对称合成的方法基于以下效果:使用辅助剂作为相同的立体分化工具,可以选择性地或替代地获得2,6-二取代的哌啶-4-酮的两个对映体。另外,碳水化合物助剂控制通过将铜酸酯共轭添加至N-半乳糖基八氢喹啉-4-酮而形成的烯醇的立体选择性质子化。 反式 -4a- epi- pumiliotoxin C 和顺式 -4a- epi 的合成 -perhydro-219A说明了十氢喹啉生物碱的不对称合成概念。