Photomediated Spirocyclization of <i>N</i>-Benzyl Propiolamide with <i>N</i>-Iodosuccinimide for Access to Azaspiro[4.5]deca-6,9-diene-3,8-dione

Abstract

A metal- and oxidant-free route for affording azaspiro[4.5]deca-6,9-diene-3,8-dione via photomediated iodinated spirocyclization of <i>N</i>-(4-methoxybenzyl) propiolamide has been developed. The reaction underwent a radical addition/<i>ipso</i>-cyclization/dearomatization process at room temperature and successfully constructed C-C and C-I bonds. This green and convenient approach could be generally expanded to produce a range of iodinated spirocyclization products in moderate to good yields.