On the synthesis of α-di-(methylmercapto)-methylene derivatives of symmetrical ketones
作者:O. Arjona、J.A. Cereceda、M.L. Quiroga
DOI:10.1016/0040-4020(80)80104-9
日期:1980.1
The generation of synthetic intermediates α-di-(methylmercapto)-methyleneketones 1 has been optimized. Selection of the best base/solvent system for quantitative formation of 1 is justified.
α-Oxoketene dithioacetals: Versatile substrates for 1,3-carbonyl transpositions
作者:R.Karl Dieter、Yawares Jenkitkasemwong
DOI:10.1016/s0040-4039(00)87696-0
日期:1982.1
A two step procedure for the conversion of α-oxoketene dithioacetals to β-substituted α, β-unsaturated thioesters or acids is described. The overall transformation represents a 1,3-carbonyl transposition in which the original ketone carbonyl emerges as the carbonyl of an acid or thioester. The resulting thioesters and acids constitute versatile acylating reagents in accord with established procedures
A Convenient One-Pot Synthesis of Ketene Dithioacetals
作者:Didier Villemin、Abdelkrim Ben Alloum
DOI:10.1055/s-1991-26449
日期:——
An easy synthesis of ketene dithioacetals 2 and 3 by the condensation of carbon disulfide and active methylene compounds 1 with subsequent alkylation in the presence of potassium fluoride is described.
Regioselective synthesis of 3-(methylthio)phenols by formal [3+3]-cyclocondensations of 3-oxo-bis(methylthio)ketenacetals with 1,3-bis(trimethylsilyloxy)-1,3-butadienes and 1,3-dicarbonyl dianions
The cyclization of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-oxo-bis(methylthio)ketenacetals afforded 3-(methylthio)phenols containing an acyl or ester substituent located at position 2. The cyclization of free 1,3-dicarbonyl dianions with 3-oxo-bis(methylthio)ketenacetals resulted in the formation of regioisomeric products containing an acyl group located at position 6.
Regioselective Synthesis of
Functionalized 3-(Methylthio)phenols by the First Formal [3+3] Cyclocondensations
of 1,3-Bis(trimethylsilyloxy)-1,3-butadienes with 1,1-Bis(methylthio)-1-en-3-ones
The [3+3] cyclocondensation of 1,3-bis(silyl enol ethers) with 1,1-bis(methylthio)-1-en-3-ones results in the regioselective formation of 3-(methylthio)phenols. The products represent useful synthetic building blocks, which are not readily available by other methods.