Reaction of 2-aminobenzazoles such as 2-amino-benzothiazole, -benzoxazole, and-benzimidazole with acetylene compounds was reported comparing with the condensation product of these benzazoles and ethoxy methylenemalonate. In the former case, 2-oxo compounds were obtained while 4-oxo compounds were the product in the latter condensation. The structure of these products was confirmed from nuclear magnetic resonance and mass spectra.
报道了
2-氨基苯并噻唑、
2-氨基苯并噻唑、2-
苯并恶唑和-
苯并咪唑等2-
氨基苯并唑与
乙炔化合物的反应,并与这些苯并唑和乙氧基亚
甲基丙二酸酯的缩合产物进行比较。在前一种情况下,得到2-氧代化合物,而4-氧代化合物是后一缩合中的产物。这些产物的结构通过核磁共振和质谱得到证实。