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Communication | Regular issue | Vol 12, No. 9, 1979, pp.1179-1181
Published online, 1st January, 1970
DOI: 10.3987/R-1979-09-1179
Preparation and Base-catalyzed Rearrangement of Thioxanthenium Biscarbomethoxymethylides

Yasumitsu Tamura,* Chisato Mukai, and Masazumi Ikeda

*Faculty of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Toyonaka, Osaka 560-0043, Japan

Abstract

Thioxanthenium biscarbomethoxymethylide and its trans-9-methyl derivative were prepared by thermal reaction of the corresponding thioxanthenes with dimethyl diazomalonate in the presence of copper sulfate. These sulfonium ylides underwent base-catalyzed rearrangement to the corresponding 9-(biscarbomethoxymethyl)thioxanthenes.