Chemistry of indole

Under the influence of halide compounds of phosphorus, acetic acid -phenylhydrazides that have an alkyl group attached to at least one of the nitrogen atoms form 2-aminoindoles that do not have substituents in the 3 position. Similarly, 1-phenyl-2-acetylpyrazolidines are converted to 1,2,3,4-tetrahydropyrimido[1,2-a]indoles.See [1] for communication XXXV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 647–652, May, 1973.