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An efficient synthesis of novel 3-oxotetrahyrothiazolo[3,2-c]pyrimidine-8-carboxylate derivatives was developed by reacting 4-oxothiazolidines with formaldehyde and amines under very mild conditions. A variety of novel thiazolopyrimidine carboxylates were attained rapidly by double Mannich/intramolecular cyclisation reactions in very good yields.

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Base-Promoted New C-C Bond Formation: An Expedient Route for the Preparation of Thiazolo-and Imidazolo-Pyridinones via Michael Addition. -(YILDIRIM*, M.; CELIKEL, D.; EVIS, N.; KNIGHT, D. W.; KARIUKI, B. M.; Tetrahedron 70 (2014) 35, 5674-5681, http://dx.