Stereoselective hydrogen transfer reactions of vinyl radicals: Cyclization of alkynyl iodides by Unimolecular Chain Transfer from silicon hydrides
作者:Angeles Martinez-Grau、Dennis P. Curran
DOI:10.1016/s0040-4020(97)00257-3
日期:1997.4
hexynyl and heptynyl iodides proceeds stereoselectively to give either E- or Z-exocyclic double bonds depending on the type of precursor and radical chain used. In UniMolecularChain Transfer (UMCT) reactions, the intramolecular abstraction of hydrogen by the intermediate vinyl radical leads exclusively to the E-isomer while the traditional tin hydride method usually provides the Z-isomer with good