The intramolecular cycloaddition of azides with ω-chloroalkenes. A facile route to (±)-swainsonine and other indolizidine alkaloids
作者:William H. Pearson、Ko-Chung Lin
DOI:10.1016/s0040-4039(00)97301-5
日期:1990.1
A potentially general route to the 1-azabicyclo[n.m.O]alkane skeleton of various alkaloids is embodied in the intramolecular 1,3-dipolar cycloaddition of aliphatic azides with ω-chloroalkenes. Cycloaddition is followed by rearrangement and intramolecular N-alkylation, affording bicyclic iminium ions1 in one operation. The application of this method to the synthesis of (±)-δ-coniceine6, (1S,2R,8aR)-indolizidine-1
脂肪族叠氮化物与ω-氯烯烃的分子内1,3-偶极环加成反应了通往各种生物碱的1-氮杂双环[nmO]烷烃骨架的潜在一般路线。环加成后进行重排和分子内N-烷基化,一次操作即可得到双环亚胺鎓离子1。描述了该方法在合成(±)-δ-可卡因6,(1S,2R,8aR)-吲哚并吡啶-1,2-二醇13和(-)-芥子碱15中的应用。