Application of Commercially Available Anhydrous Potassium Fluoride for a Convenient Synthesis of Ketene Dithioacetals
作者:Sabir H. Mashraqui、Harini Hariharasubrahmanian
DOI:10.1039/a901038f
日期:——
Commercially available anhydrous KF without activation or solid support promotes condensation between activemethylene compounds, carbon disulfide and an alkylatingagent in dry DMF to allow the preparation of a variety of ketene dithioacetals in fair to good yields under ambient conditions.
Synthesis, rearrangements, and fragmentation of ketene mercaptals derived from ketones or β-diketones and carbon disulphide
作者:L. Dalgaard、L. Jensen、S.-O. Lawesson
DOI:10.1016/s0040-4020(01)97222-9
日期:1974.1
By use of the ion pair extraction technique, tetrabutylammonium salts of acetylacetone, benzoylacetone, and dibenzoylmethane were reacted with carbon disulphide to give salts of dithioacids. Alkylation gave dithioesters and ketene mercaptals. A simple procedure for the preparation of 2-diacylmethylene-1,3-dithietanes was found. Cyclisation reactions of some acetylacetone derivatives gave a 1,3-dithiolane
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.
An efficient protocol toward fully substitutedthiophenes and thieno[2,3-b]thiophenes has been developed through CuCl2-catalyzed annulative coupling of S,S-disubstituted enones with diazo compounds under mild conditions. Tetrasubstituted thiophenes and thieno[2,3-b]thiophenes were efficiently accessed by variation of the feed ratio of the reactants in good to excellent yields, respectively. The synthetic