N-Alkylation of iodo lactams with reactive alkylhalides, or of the derived selenide lactams with less reactive alkylhalides, leads to substrates for free radical initiated cyclization to pyrrolizidinones and indolizidinones, e. g. 2 → 3. The first examples of iodide / vinyl bromide, selenide / aldehyde, and selenide / vinyl chloride radical cyclizations are described.
Stereocontrolled synthesis of diamines from iodolactams
作者:Spencer Knapp、Anthony T Levorse
DOI:10.1016/s0040-4039(00)95474-1
日期:1987.1
Displacement of iodide from iodolactams by azide occurs with retention of configuration if a catalytic amount of NaH is added, due to the intervention of an N-acyl-aziridine. Several diamine equivalents and a spermidine analogue are prepared in this way.