Aza-Cope Rearrangement−Mannich Cyclizations for the Formation of Complex Tricyclic Amines: Stereocontrolled Total Synthesis of (±)-Gelsemine
作者:William G. Earley、Jon E. Jacobsen、Andrew Madin、G. Patrick Meier、Christopher J. O'Donnell、Taeboem Oh、David W. Old、Larry E. Overman、Matthew J. Sharp
DOI:10.1021/ja055710p
日期:2005.12.1
gelsemine. Using a sequential base-promoted oxy-aza-Cope rearrangement/Mannich cyclization sequence, gram quantities of azatricyclo[4.4.0.0(2,8)]decanone 18, a central intermediate in our total of (+/-)-gelsemine, were prepared from 3-methylanisole in 12 steps and 16% overall yield.
描述了使用 aza-Cope 重排-Mannich 环化序列组装gelsemine 的氮杂三环[4.4.0.0(2,8)]癸烷核心的详细检查。衍生自内向取向的 1-甲氧基-或 1-羟基双环 [2.2.2] oct-5-烯胺的亚胺离子和 N-酰氧基亚胺离子不经历该序列的第一步,即阳离子氮杂-Cope 重排,形成顺式-氢异喹啉离子。然而,类似的碱促进的氧-氮杂-Cope 重排确实发生形成顺式-氢异喹诺酮类化合物,其含有允许在后续步骤中区域选择性地生成亚胺鎓离子或N-酰氧基亚胺鎓离子的官能团。以这种方式制备的顺式-氢异喹诺酮类化合物的曼尼希环化有效地组装了gelsemine的氮杂三环[4.4.0.0(2,8)]癸烷单元。