Fe(III)-Catalyzed Intermolecular C(sp²)-C(sp³) Dehydration Coupling Reaction of Ketene Dithioacetals and Propargyl Alcohols: Synthesis of Novel gem-Dialkylthiopenten-4-ynes and Further Conversion into Methyl Pent-4-ynoates
作者:Jin-Na Song、Peiqiu Liao、Zhongxue Fang、Ying Liu、Ran Li、Lixin Xu、Badru-Deen Barry、Qun Liu、Xihe Bi
DOI:10.1055/s-0030-1260333
日期:2011.10
We report an iron(III)-catalyzed intermolecular C(sp²)-C(sp³) dehydration coupling reaction between ketene dithioacetals and propargyl alcohols, leading to the synthesis of gem-dialkylthiopenten-4-ynes in high efficiency. The products could be transformed into methyl pent-4-ynoates in high yields.
DBSA-catalyzed Friedel–Crafts alkylation of cyclic ketene dithioacetals with alcohols in water
作者:Haifeng Yu、Peiqiu Liao
DOI:10.1016/j.tetlet.2016.05.062
日期:2016.6
A novel DBSA-catalyzed Friedel–Crafts alkylation of cyclic ketene dithioacetals, internal alkenes with highly nucleophilic carbon atom adjacent to the electron-withdrawing group, with alcohols in water has been developed. The reaction is efficient in the presence of catalyst loading as low as 10 mol % in water at reflux, and a wide range of alkylated ketene dithioacetals are synthesized in excellent
gem-Dialkylthio vinylallenes were obtained for the first time and applied to the divergent synthesis of fully-substituted pyrroles and thiophenes by domino cyclizations. These two cyclization pathways were regulated by alkylthio groups. Plausible reaction mechanisms were presented and supported by DFT calculations. An unprecedented metal-free carbothiolation was discovered in the formation of thiophenes