Synthesis of 1-Azaspirocycles via Lewis Acid-Mediated Spirocyclization of Cyclic N-Acyl-N,O-acetals
作者:Toshimasa Ito、Naoki Yamazaki、Chihiro Kibayashi
DOI:10.1055/s-2001-17475
日期:——
A new approach to 1-azaspirocycles has been developed starting from cyclic N-acyl-N,O-acetals. This sequence involves olefin-iminium cyclization mediated by Lewis acids leading to the spirocyclization products including the chlorinated products and the olefinic products. Mixtures of these products underwent catalytic hydrogenation and reductive dechlorination to produce the 1-azaspirans.
从环状 N-酰基-N,O-乙醛开始,我们开发出了一种 1-氮杂螺环的新方法。该方法涉及路易斯酸介导的烯烃-亚氨环化,从而产生螺环化产物,包括氯化产物和烯烃产物。这些产物的混合物经过催化加氢和还原脱氯反应生成 1-氮杂环戊烷。