ChemInform Abstract: Regioselective Preparation of 3,4-Dihydro-4-methyl-2H,6H-(1,3)thiazino( 2,3-b)quinazolin-6-ones and 2,3-Dihydro-3-methyl-5H-thiazolo(2,3-b) quinazolin-5-ones and Analogous Polycyclic Pyrimidinone Derivatives from Condensed 2-Alkenylthiopyrimidine-4(3H)-ones.

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