Nucleophilic addition-elimination reactions of N-(p-tolylsulphonyl)vinylsulphoximines: preparation of α-methylene nitriles and phosphonates
作者:Peter L. Bailey、Richard F.W. Jackson
DOI:10.1016/0040-4039(91)80705-b
日期:1991.6
Treatment of N-(p-tolylsulphonyl)vinylsulphoximines (1) with lithium cyanide in DMF at room temperature leads to efficient formation of α,β-unsaturated nitriles (3), via a Michael addition-proton transfer-elimination process, in which the polarity of the double bond is reversed. Analogous reaction with lithium dimethylphosphonate leads to β-dimethylphosphonyl sulphoximines (7), which are converted
The Arbuzov reaction of trimethyl and triethyl phosphites with acyl chlorides gave 1-oxoalkylphosphonates in 57–80% yields. The Wittig reaction of the phosphonates with methylenetriphenylphosphorane gave vinylphosphonates in 25–59% yields. Hydroboration of vinylphosphonates in oxolane gave 2-hydroxyethylphosphonates in 50–65% yields. The procedure seems to be a good synthetic method to afford 1-alkyl-substituted