Applications of Phthalimide Photochemistry to Macrocyclic Polyether, Polythioether, and Polyamide Synthesis
作者:Ung Chan Yoon、Sun Wha Oh、Jae Ho Lee、Jong Hoon Park、Kyung Tae Kang、Patrick S. Mariano
DOI:10.1021/jo001457u
日期:2001.2.1
polythioether, and polysulfonamide products. These photocyclization reactions follow sequential single electron transfer (SET)-desilylation pathways. Only in the cases of phthalimides, bearing mixed ether-thioether N-substituents, do these excited-state cyclization reactions proceed with lower degrees of regioselectivity. This is a result of competitive desilylation and alpha-to-sulfur deprotonation reactions
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.