| 摘要 |
N-(5-tetrazolyl)-4-oxo-4H-pyrimido-(2,1-b)-benzothiazoles(I; Rl = H, C1-3 alkoxy, C1-3 alkoxy, hydroxy chloro, fluoro, trifluoromethyl, nitro, amino, methylthio; R2 = H, C1-3 alkyl, C1-3 alkoxy, hydroxy, chloro, fluoro, methylthio; R1 and R2 are able to couple to form methylene dioxy or ethylene dioxy), useful as antiallergic agent, were prepd. by acylation of 5-aminotetrazole with compd.(II; C-X is activated 3-carboxyl group).
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