Synthetic and Thermogravimetric Studies of 5-Amino-2-ethoxycarbonylaminothiazoles
摘要:
5-Amino-4-cyano-2-ethoxycarbonylaminothiazole (2), 2-ethoxycarbonylaminothiazolo[5,4-d]pyrimidine-7(6H)-one (4), and 5-ethoxymethyleneamino-4-cyano-2-ethoxycarbonylaminothiazole-4-carboxamide (9) were synthesized from 5-amino-2ethoxycarbonylaminothiazole-4-carboxamide (1). Unlike simple 5-aminothiazoles, 1 and 2 did not undergo rearrangement in hot aqueous alkali, because of the role of their 2-ethoxycarbonylamino substituents. Thermogravimetric experiments on 1, 2, 4, and 9 revealed routine elimination of ethanol molecule from the NHCO 2C2H5 substituent of 1, 2, 4, and 9.