Regioreversed nucleophilic substitution of 2-(allyloxy)benzothiazole by allylic Grignard reagents. A regioselective synthesis of 1,5-dienes
作者:Vincenzo Calo、Luigi Lopez、Giannangelo Pesce
DOI:10.1039/p19880001301
日期:——
2-(Allyloxy)benzothiazoles react with allylic organomagnesium compounds in the presence of copper bromide to give 1,5-dienes. The C–C coupling occurs almost exclusively in a head-to-tail fashion. Contrary to this the same electrophiles, when complexed with copper(I) bromide before the addition of the allylicGrignardreagents, give only 1,5-dienes derived from a head-to-head coupling process. The change