Application of the Remote Photocyclization with a Pair System of Phthalimide and Methylthio Groups. A Photochemical Synthesis of Crown Ether Analogs

Abstract

Based on the regioselective remote photocyclization of a pair system consisting of a phthalimide group and a methylthio group, a homologous series of N-substituted phthalimides (4) possessing a terminal sulfide function in the poly-ether side chain afforded, on irradiation, seven- to fifteen-membered crown ether analogs (5-7) in moderate yields.