Synthesis and reactivity of enantiomerically pure N-alkyl-2-alkenyl azetidinium salts
作者:François Couty、François Durrat、Gwilherm Evano、Damien Prim
DOI:10.1016/j.tetlet.2004.07.113
日期:2004.9
A synthesis of stereodefined enantiomerically pure 2-alkenyl azetidines is described using Wittig olefination as key step. The quaternary triflate ammonium salts of these heterocycles were prepared in a stereoselective way and treatment of these azetidinium salts with a base (KHMDS or PhLi) induced a regioselective Stevensrearrangement leading to a 3-alkenyl pyrrolidine. An unprecedented SN2′ reaction
以维蒂希烯化为关键步骤描述了立体定义的对映体纯的2-烯基氮杂环丁烷的合成。以立体选择性的方式制备这些杂环的季铵盐季铵盐,并用碱(KHMDS或PhLi)处理这些氮杂环丁鎓盐可引起区域选择性的史蒂文斯重排,从而形成3-烯基吡咯烷。在一种情况下,观察到了前所未有的S N 2'反应,其中涉及苯基锂为亲核试剂和铵为离去基团。