Oxygen transfer during the copper induced reaction of α,β-epoxy diazomethyl ketones
作者:L. Thijs、B. Zwanenburg
DOI:10.1016/0040-4020(80)80106-2
日期:1980.1
Reactions of α,β-epoxy diazomethyl ketones 1a-1with activated copper powder or copper(II) sulfate in methanol (or ethanol) lead to 1,1 - dialkoxy - but - 3 - ene - 2 - ones 2 (or 3) in good yields. This process of oxygentransfer proceeds via initially generated keto-carbenoids which react intramolecularly with the epoxide function to give bicyclic intermediates 10. Release of strain and subsequent