Reactions of stabilized sulfur ylides with α,β-unsaturated alkoxychromiumcarbene complexes
作者:Benito Alcaide、Luis Casarrubios、Gema Domínguez、Angel Retamosa、Miguel A. Sierra
DOI:10.1016/0040-4020(96)00796-x
日期:1996.10
stable ylides would add preferentially to the carbene carbon, 1,4-addition increasing as the stability of the ylide does. For more stable ylides 1,4-addition is preferred and substitution at the β-carbon has little effect in the chemoselectivity. Methoxycarbonylmethylentriphenylphosphorane exclusively add to the carbene carbon while ethyl diazoacetate is unreactive towards α,β-unsaturated alkoxychromium-carbene