Silicon-assisted synthesis of bridged azabicyclic systems via N-acyliminium intermediates
作者:Wim J. Klaver、Henk Hiemstra、W.Nico Speckamp
DOI:10.1016/s0040-4020(01)90113-9
日期:1988.1
with five- and six-membered cyclic N-acyliminium ion precursors lead to bridged azabicyclic compounds (Table I). Neat formic acid is the reaction medium of choice in most cases. The cyclization reactions take place with complete regioselectivity. 2-Propynylsilanes are more reactive than allylsilanes. An ordinary olefin reacts poorly. The cyclization products can be useful for the synthesis of γ- and
分子内酸介导的2-丙炔基和烯丙基硅烷与五元和六元环状N-酰基亚胺离子前体的反应导致桥连的氮杂双环化合物(表I)。在大多数情况下,纯甲酸是首选的反应介质。环化反应以完全的区域选择性进行。2-丙烯基硅烷比烯丙基硅烷更具反应性。普通烯烃反应不良。环化产物可用于合成γ-和δ-氨基酸及其衍生物。