"placeholder" during regioselective 1,2-migration with retention by the resulting spirocyclic ammonium ylide, and a hydroxyl surrogate for an eventual stereoselective Fleming-Tamao oxidation. This chemistry represents a novel use of the Stevens rearrangement and offers a short, enantioselective route to hydroxylated quinolizidines such as 3 from Boc-pyrrolidine.
[反应:参见正文] 2-甲
硅烷基
吡咯烷的甲
硅烷基基团起几个关键作用:除环氮外,在面部选择性类
胡萝卜素中的立体
化学控制元素,在区域选择性1,2-迁移过程中保留的立体
化学“占位符”通过生成的螺环
铵盐和羟基替代物进行最终的立体选择性弗莱明-塔莫氧化。该
化学反应代表了史蒂文斯重排的一种新颖用途,并提供了一条短的,对映选择性的途径,使之与羟基化的喹oli嗪类似,例如来自Boc-
吡咯烷的3。