New Regioselective Synthesis of 7H-Imidazo[2,1-b][1,3]thiazine and 2H,6H-Pyrimido[2,1-b][1,3]thiazine Derivatives. - Landreau, Cyrille; Deniaud, David; Reliquet, Alain; Meslin, Jean Claude (Synthesis, 2002)