First Direct Evidence of Radical Intermediates in Samarium Diiodide Induced Cyclization by ESR Spectra
作者:Masakazu Sono、Shin-ichi Hanamura、Midori Furumaki、Hisao Murai、Motoo Tori
DOI:10.1021/ol202403q
日期:2011.11.4
The mechanism of samariumdiiodide (SmI2)-induced cyclization of α,β-unsaturated esters and ketones to bicyclic compounds was examined using ESR spectroscopy. This is the first report of direct evidence of the radical intermediates in the SmI2 reaction. The preferential reduction of the α,β-unsaturated carbonyl part in some substrates should be recognized as a main route.