Reaction of epoxides with activated DMSO reagent. General method for synthesis of α-chlorocarbonyl compounds: Application in asymmetric synthesis of (3S)-2,3-oxidosqualene
作者:Sushil Raina、Vinod K. Singh
DOI:10.1016/0040-4020(94)01111-c
日期:1995.2
Reaction of a variety of epoxides with DMSO-Oxalyl chloride in the presence of a catalytic amount of methanol and a base was studied. Disubstituted epoxides gave α-chloroketones in high yields. Aliphatic terminal epoxide underwent opening reaction to provide α-chloroketone as a major product. Trisubstututed epoxides provided α-chloroketones as major products through the formation of more stable carbocation
Pyridinium Dichromate in Organic Chemistry: A New Synthesis of Enedicarbonyl Compounds
作者:Maurizio D'Auria、Antonella De Mico、Franco D'Onofrid、Arrigo Scettri
DOI:10.1055/s-1985-31419
日期:——
Enedicarbonyl compounds (2-alkene-1,4-diones) are prepared by oxidation of 1-substituted 3-alkenols (homoallylic alcohols) with pyridinium dichromate in dimethylformamide. The reaction proceeds via 3-alkenyl ketones as intermediates which can in some cases be isolated after short reaction times.