Synthesis of 1-azaspiro[4.4]nonan-1-oxyls via intramolecular 1,3-dipolar cycloaddition
作者:Yulia V Khoroshunova、Denis A Morozov、Andrey I Taratayko、Polina D Gladkikh、Yuri I Glazachev、Igor A Kirilyuk
DOI:10.3762/bjoc.15.200
日期:——
Sterically shielded nitroxides of the pyrrolidine series have shown the highest resistance to reduction. Here we report the synthesis of new pyrrolidine nitroxides from 5,5-dialkyl-1-pyrroline N-oxides via the introduction of a pent-4-enyl group to the nitrone carbon followed by an intramolecular 1,3-dipolar cycloaddition reaction and isoxazolidine ring opening. The kinetics of reduction of the new