Cycloaromatization of α-Oxoketene Dithioacetals with 5-Lithiomethyl-3-methylisoxazole: A New General Method for the Synthesis of Substituted and Annulated 1,2-Benzisoxazoles
The reactions of enamines with sulfoxides bearing α-hydrogens in the presence of a magnesium amide, generated in situ from the reaction of ethylmagnesium bromide with diisopropylamine, afforded the corresponding α-sulfenylalkylated ketones and aldehydes in isolated yields ranging from 39 to 76%. This procedure was successfully extended to the bis(methylthio)methylation with methyl (methylthio)methyl
Theα-oxoketene dithioacetals are shown to undergo conjugate 1,4-reduction in highly regio- and chemoselective manner with sodium borohydride in acetic acid to afford the corresponding β-oxodithioacetals in good yields. These results have been rationalized according to HSAB principle in terms of 'hard soft affinity inversion' concept. The reduction of with sodium cyanoborohydride also proceeds in 1
Electroreductive cleavage of carbon-sulphur bonds in dithioacetals
作者:Nicola Schultz-von Itter、Eberhard Steckhan
DOI:10.1016/s0040-4020(01)81653-7
日期:——
Partial Reductive Demethylthiolation of<i>a</i>-Ketoketene<i>S,S</i>-Acetals with Sodium Borohydride/Nickel Chloride: A New, General Method for 2-Methylthio-1-alkenyl Ketones
作者:B. Myrboh、L. W. Singh、H. Ila、H. Junjappa
DOI:10.1055/s-1982-29791
日期:——
RAO, CH. SRINIVASA;CHAKRASALI, R. T.;ILA, HIRIYAKKANAVAR;JUNJAPPA, HIRIYA+, TETRAHEDRON, 46,(1990) N, C. 2195-2204
作者:RAO, CH. SRINIVASA、CHAKRASALI, R. T.、ILA, HIRIYAKKANAVAR、JUNJAPPA, HIRIYA+