Journal of the Chemical Society. Perkin transactions I p. 2978 - 2981 (1981)
Update date:2022-09-26
Topics:
Tamura, Yasumitsu
Takebe, Yasushi
Mukai, Chisato
Ikeda, Masazumi
Heating thiochroman-4-ones with dimethyl diazomalonate without solvent or in refluxing toluene in the presence of copper(II) sulphate gave the corresponding bismethoxycarbonylmethanides (4) and dimethyl 5-oxo-2,3,4,5-tetrahydro-1-benzothiepin-2,2-dicarboxylates (5).Treatment of the sulphonium methanides (4) with triethylamine afforded (5).
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