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Heteroannulation of 2-(Bis(methylthio)methylene)-1-methyl-3-oxoindole with β- substituted β-lithioaminoacrylonitrile, malononitrile and guanidine has been reported to yield novel substituted pyrido(3,2-b)indoles and pyrimido(5,4-b)indole derivatives in varying yields.

Heteroaromatic annulation studies on 2-[bis(methylthio)methylene]-1-methyl-3-oxoindole: synthesis of novel heterocyclo[b] fused indoles