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■ A Novel Synthesis of 5-Alkyl-6-cyano-2,3-dihydro-4H-1,4-thiazines

Z. Tanee Fomum, J. Tanyi Mbafor, Stephen R. Landor, and Phyllis D. Landor

*Department of Chemistry, Mona Campus, , University of the West Indies, Mona, Kingston 7, Jamaica

Abstract

4,4-Dialkylallenyl nitriles react with 2-aminoethanethiol in the presence of 2 equivalents of base to give 5-alkyl-6-cyano-2,3-dihydro-4H-1,4-thiazines and not 2-alkylthiazolines previously isolated with catalytic base.