Electroinitiated oxygenation of alkenyl sulfides and alkynes in the presence of thiophenol
摘要:
Electrolysis of alkenyl sulfides in the presence of thiophenol with bubbling of molecular oxygen gave the corresponding alpha-(phenylthio) carbonyl compounds with the consumption of a catalytic amount of electricity. An electroinitiated radical chain mechanism has been proposed. The reaction also took place without electrochemical initiation, but much (5-50 times) longer reaction time was required for the completion of the reaction. The potential utility of the present reaction in organic synthesis is demonstrated by the net 1,2-transposition of a phenylthio group and a carbonyl group. The electroinitiated oxygenation of ketene dithioacetals also proceeded smoothly to give the corresponding alpha-(phenylthio) thiol esters. It was also found that the electroinitiated oxygenation of alkynes in the presence of thiophenol gave alpha-(phenylthio) carbonyl compounds. A mechanism involving the initial formation of alkenyl sulfides has been proposed.
Ketene bis(phenylthio)acetals. Easily prepared intermediates for the conversion of acids and esters to .alpha.-alkylidene ketones and sulfur-substituted dienes
作者:Theodore Cohen、Richard E. Gapinski、Robert R. Hutchins
DOI:10.1021/jo01334a040
日期:1979.9
COHEN T.; GAPINSKI R. E.; HUTCHINS R. R., J. ORG. CHEM., 1979, 44, NO 20, 3599-3601