3-ethyl-2-methy-1,3-benzothiazol-3-ium perchlorate 、
2-phenyl-5-formylthiazolo<2',3',4':4,5,6>pyrimido<1,2-c>pyrimidine 在
乙酸酐 作用下,
以65%的产率得到5-<2-(3-ethyl-2(3H)-benzothiazolylidene)ethylidene>-2,7-diphenyl-5H-thiazolo<2',3',4':4,5,6>pyrimido<1,2-c>pyrimidinium perchlorate