A number of novel 3-bromo-4-methyl-7-methoxy-8-amino substituted coumarins and 2-substituted 7-bromo-6-methyl-8H-pyrano-benzimidazoles, benzoxazoles and/or benzoxazine-8-ones were synthesized for the purpose of pharmacological evaluation. Some representative compounds showed antitumor activity in vitro on Ehrlich ascites carcinoma in the preliminary testing.

4‐(1H‐benzo[d]imidazol‐2‐yl)thiazol‐2‐amine and its 1‐methyl derivative (1) were reacted with different reagents such as acid anhydrides, malononitrile, chloroacetyl chloride, and aromatic aldehydes to produce the corresponding benzimidazole products 2, 3, 4, 5, 6, 7, 8, 9, respectively. Also, 2‐chloro‐N‐(4‐(1‐methyl‐1H‐benzo[d]imidazol‐2‐yl)thiazol‐2‐yl) acetamide (6) was reacted with diaminoethane, ortho‐substituted aniline, thioglycolic acid, thiosemicarbazide derivatives, secondary amines, and potassium isothiocyanate to afford the corresponding derivatives 10, 11, 12, 13, 14, 15, 16, 17, respectively. The cytotoxic activity of some newly synthesized derivatives was studied against two different cell lines HepG2 and PC12. Compounds 9 and 15b showed promising anticancer activity against both types of the tested cancerous cell lines.

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