Optically active allylic sulphides 10–13, bearing two different leaving groups, react with organocopper reagents by selective substitution of the heterocyclic moiety leading to optically active homoallylic pivalates with chemo-, regio- and enantio- control. This selectivity seems to be related to the coordination exerted by the heterocyclic nucleus towards the organometal.
Calo Vincenzo, Fiandanese Vito, Nacci Angelo, Scilimati Antonio, Tetrahedron, 50 (1994) N 24, S 7283-7292
作者:Calo Vincenzo, Fiandanese Vito, Nacci Angelo, Scilimati Antonio
DOI:——
日期:——
Regiocontrol by anchimeric co-ordination in the reactions of organocopper reagents with allylic substrates bearing two leaving groups. Synthesis of optically active homoallylic alcohols
作者:Vincenzo Calò、Concetta De Nitti、Luigi Lopez、Antonio Scilimati
DOI:10.1016/s0040-4020(01)89853-7
日期:1992.1
The regiochemistry in the reactions of organocopper reagents with allylic electrophiles bearing two different leaving groups has been studied. Sulphide ester like 4 react with organocopper reagents through regioselective substitution of the sulphide group to give esters of homoallylic alcohols. This regiocontrol is due to the anchimeric co-ordination exerted towards the organometallic reagent by the