Rapid migration of sulphur groups in the photochemical conversion of 3-azido-2-vinylthiophenes into thienopyrroles
作者:Raymond S. Gairns、Christopher J. Moody、Charles W. Rees
DOI:10.1039/c39850001818
日期:——
irradiation in acetonitrile, the 3-azido-2-vinylthiophenes (4) give the thieno[3,2-b]pyrroles (8) as the sole, or major, products formed by migration of the group Y (Scheme 2) in preference to or in competition with the group Z in the non-aromatic fused 2H-pyrrole intermediate (5), sulphur groups (Y = PhS, MeS, PhSO, PhSO2, MeSO, MeSO2) migrating particularly rapidly.
在乙腈中照射时,3-叠氮基-2-乙烯基噻吩(4)给出噻吩[3,2- b ]吡咯(8)作为唯一或主要产物,是由Y基团的迁移形成的(方案2)在非芳香族稠合2 H-吡咯中间体(5)中,Z组优先或与Z组竞争时,硫基(Y = PhS,MeS,PhSO,PhSO 2,MeSO,MeSO 2)迁移特别迅速。