Heterocycles p. 1759 - 1766 (1997)
Update date:2022-07-29
Topics:
Miki, Yasuyoshi
Hachiken, Hiroko
Sugimoto, Yoshiko
Yanase, Norihide
Reaction of 1-benzylindole-2,3-dicarboxylic anhydride with methylene-triphenylphosphorane (Ph3P=CH2) and carbethoxymethylenetriphenylphosphorane (Ph3P=CHCOOEt) gave [2-(3-carboxyindol-2-yl)-2-oxoethylidene]triphenylphosphorane derivatives, which were converted to cyclopenta[b]indol-3-ones after decarboxylation and treatment with aldehydes. On the other hand, the anhydride reacted with carbethoxyethylidenetriphenylphosphorane (Ph3P=C(Me)COOEt) to afford a mixture of two enol lactones.
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