α,β-Epoxy Sulfoxides as Useful Intermediates in Organic Synthesis. II. A Novel Synthesis of α-Sulfenylated Ketones and α-Sulfenylated Aldehydes from α,β-Epoxy Sulfoxides
作者:Tsuyoshi Satoh、Takumi Kumagawa、Koji Yamakawa
DOI:10.1246/bcsj.58.2849
日期:1985.10
Treatment of α,β-epoxy sulfoxides, prepared from 1-chloroalkyl phenyl sulfoxides and carbonyl compounds, with various kinds of alkane- or arenethiolates afforded α-sulfenylated ketones in good yields. This method also offered a novel procedure for a synthesis of α-sulfenylated aldehydes.
Treatment of α,β-epoxy sulfoxides with excess sodium phenylselenide and various kinds of alkylthiolates gave dialkyl ketones and α-sulfenylated carbonylcompounds, respectively, in good yields under mild conditions.
Halides-based electrophiles mediated epoxide ring-opening reactions of α,β-epoxysulfoxides in C6-series : Deoxygenation versus dehydration and an overall 1,2-keto transposition
several halides-based electrophiles are described. Mechanistic considerations for deoxygenation as well as dehydration reactions are also discussed. In addition, methodology for achieving 1,2-carbonyltransposition starting with isomerically pure cyclohexenyl sulfides derived from isophorone and cholestan-3-one is briefly reported.
Enolates were generated from α,β-epoxy sulfoxides using lithium dimethylcuprate as an electron-transfer reagent. The enolates were trapped with several electrophiles, in which aldehydes reacted with the generated enolates giving aldols in good yields with high regioselectivity.
The aldols are synthesized from three compoments (1-chloroalkyl phenyl sulfoxide and two kinds of carbonyl compounds and ) through α,β-epoxy sulfoxides using lithiumdimethylcuprate as an electron-transfer reagent.