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.
α-Phenylthio-α,β-alkenones (2), readily available by Pd(II)-catalysed coupling of (E)-1-phenylthio-1-tributylstannylhex-1-ene with the corresponding acid chlorides, have been treated with borane in the presence of phenylglycine- or proline-derived oxazaborolidines to afford 2-phenylthio-2-alken-1-ols (3) with good to excellent enantioselectivities. Ozonolysis of 3 provides a new and efficient route
Reduction of α-methylthio and α-phenylthio ketones 1 with L-Selectride gave syn-alcohols 2 in high stereoselectivity except when R1 was cyclohexyl group, while reduction with Zn(BH4)2 gave the isomeric anti-alcohols 3 provided R3 was methyl group.