Attempted Simmon–Smith reaction on β-alkylthio-α,β-unsaturated ketones: a regiospecific synthesis of 2,4-disubstituted thiophenes
作者:Toreshettahally R. Swaroop、Rangaswamy Roopashree、Hiriyakkanavar Ila、Kanchugarakoppal S. Rangappa
DOI:10.1016/j.tetlet.2012.10.110
日期:2013.1
A new regiospecific route to 2,4-disubstituted thiophenes has been developed through Simmon-Smith reaction on beta-methylthio-alpha,beta-unsaturated ketones. Extension of the reaction to beta-ethylibenzylthio-alpha,beta-unsaturated ketones also gave the corresponding 2,4-disubstituted thiophenes in a regiospecific manner. A probable mechanism involving a carbenoid methylene insertion to divalent sulfur followed by intramolecular aldol condensation has been suggested.[GRAPHICS](C) 2012 Elsevier Ltd. All rights reserved.