Intramolecular Schmidt reactions of azides with carbocations: synthesis of bridged-bicyclic and fused-bicyclic tertiary amines
作者:William H. Pearson、Rajesh Walavalkar、Jeffrey M. Schkeryantz、Wen Kui Fang、James D. Blickensdorf
DOI:10.1021/ja00075a038
日期:1993.11
Aliphatic azides were captured intramolecularlyby carbocations, producing aminodiazonium ion intermediates. Carbon-to-nitrogen rearrangement then occurred, generating bridged- or fused-bicyclic a-amino carbocations or iminium ions, depending on the geometry about the C(+)-N bond. In the bridged systems, rapid elimination of the α-amino carbocations produced twisted enamines with 1-azabicyclo[3.2.2]nonene
脂肪族叠氮化物被碳正离子分子内捕获,产生氨基重氮离子中间体。然后发生碳氮重排,产生桥连或稠合双环 a-氨基碳正离子或亚胺离子,具体取决于 C(+)-N 键的几何形状。在桥接系统中,α-氨基碳阳离子的快速消除产生具有 1-氮杂双环 [3.2.2] 壬烯、1-氮杂双环 [2.2.2] 辛烯和 1-氮杂双环 [3.2.1] 辛烯骨架的扭曲烯胺。在稠合系统中,亚胺离子被硼氢化钠还原为 1-氮杂双环 [n.3.0] 烷烃,其中 n=4 或 5。这些分子内施密特反应的碳正离子是通过用三氟甲磺酸处理烯烃或醇而产生的