α,β-Epoxy Sulfoxides as Useful Intermediates in Organic Synthesis. III. A Novel Synthesis of α-Amino Ketones and α-Amino Aldehydes by Aminolysis of α,β-Epoxy Sulfoxides
prepared from 1-chloroalkyl phenyl sulfoxides or chloromethyl phenyl sulfoxide and carbonyl compounds, with alkyl- or arylamines afforded α-amino ketones or α-amino aldehydes in good yields. Treatment of thus obtained α-arylamino ketones with weak Lewis acid led to 2,3-disubstituted indoles.
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.
Various kinds of α-aminoketones and α-arylamino ketones are synthesized in good yields by aminolysis of α,β-epoxy sulfoxides which are easily prepared from alkylated chloromethyl phenyl sulfoxide and carbonyl compounds.
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.
The treatment of α,β-epoxy sulfoxides, prepared from 1-chloroalkyl phenyl sulfoxides with ketones or aldehydes, with cesium acetate in dimethyl sulfoxide in the presence of lead tetraacetate afforded α-acetoxyketones in moderate to good yields.