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■ Methyl N-Aryldithiocarbamates: Useful Reagents for the Annelation of Pyrimidines and 1,3-Oxazines to Five-membered Heterocuclic Rings

Javier Garín, María Pilar Loscertales, Enrique Meléndez, Francisco L. Merchán, Ricardo Rodriguez, and Tomás Tejero

*Department of Organic Chemistry, Instituto de Ciencias de Materiales de Aragón, University of Zaragoza, 50009-Zaragoza, Spain

Abstract

The reaction of methyl N-aryldithiocarbamates with π-excessive heteroaromatic o-amino acid derivatives leads to the annelation of 4-oxo-2-thioxopyrimidines, 2,4-dioxopyrimidines or 2-arylamino-1,3-oxazines, depending on the reaction conditions.