Heterogeneous permanganate oxidation of 1,5-dienes: a novel synthesis of 5-substituted butanolides
作者:Sundarababu Baskaran、Imadul Islam、Padma S. Vankar、Srinivasan Chandrasekaran
DOI:10.1039/c39920000626
日期:——
In the presence of a catalytic amount of water, 1,5-dienes undergo novel and unusual oxidation with potassium permanganate–copper sulfate in dichloromethane to give substituted butanolides in good yields under very mild conditions.
Obtention de tetrahydrofurannes fonctionnalises lors de l'action de reactifs organometalliques sur des γ,δ-epoxycetones
作者:Maurice Chastrette、Georges P. Axiotis
DOI:10.1016/s0022-328x(00)83466-x
日期:1981.2
The reaction of organolithium and organomagnesium reagents with γ,δ-epoxy ketones affords functionalized tetrahydrofurans by intramolecular cyclisation of an intermediate addition alkoxide. This cyclization is regioselective: the formation of a tetrahydrofuran is always observed while the tetrahydropyran isomer is never obtained. The oxiran ringopening is stereospecific and occurs with inversion of