摘要
The α-acetyl ketene dithioacetals 2, which bear various alkylthio groups, are a kind of important intermediates in organic synthesis. In this paper, dithioacetals 2 were prepared in very high yields (90%—100%) via the deacetylation reaction of the corresponding α,α-diacetyl ketene dithioacetals 1 in the presence of concentrated sulfuric acid. This reaction involves an %in-situ% electrophilic addition-deacetylation mechanism and shows the nucleophilicity of the α-carbon atom in α-oxo ketenedithioacetals. Meanwhile, when the reaction time was prolonged to 22—25 h, the β-keto thiolesters 3a and 3c were produced in good yields.
The α-acetyl ketene dithioacetals 2, which bear various alkyhhio groups, are a kind of important intermediates in organic synthesis. In this paper, dithioacetals 2 were prepared in very high yields (90% 100% ) via the deacetylation reaction of the corresponding α, α-diacetyl ketene dithioacetals 1 in the presence of concentrated sulfuric acid. This reaction involves an in-situ electrophilic addition-deacetylation mechanism and shows the nucleophilicity of the α-carbon atom in α-oxo ketenedithioacetals. Meanwhile, when the reaction time was prolonged to 22--25 h, the β-keto thiolesters 3a and 3c were produced in good yields.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期482-484,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20272008)
教育部科学技术研究重大项目资金(批准号:10412)资助.