Heterocyclic allyl sulphides 1–6 react with an excess of ethyl diazoacetate in the presence of copper(I)exafluorophosphate acetonitrile complex in dichloromethane under mild conditions to give, through the formation of homoallylic sulphides intermediates, conjugated dienoic esters in high yields.
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