The 2,3-substituted pyrroles (4) have been prepared by a general method by cyclization in cold ethereal HCl of the methylthio-amino-vinyl compounds (3), which were obtained by condensation of the keten dithioacetals (1) with 2,2-diethoxyethylamine (2).
A. Kumar, H. Ila and H. Junjappa, J. Chem. Soc., Chem. Commun., 1976, 593 DOI: 10.1039/C39760000593
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