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Activities. -A variety of novel fused benzochromene derivatives are synthesized using readily available chromenecarbonitriles (IIId-f) as the key intermediates. The majority of the compounds synthesized show antimicrobial activity. -(KHAFAGY, M. M.; ABD EL-WAHAB, A. H. F.; EID, F. A.; EL-AGRODY*, A. M.; Farmaco 57 (2002) 9, 715-722; Dep. Chem., Fac. Sci., Al-Azhar Univ., Nasr City, Cairo 11884, Egypt; Eng.) -R. Langenstrassen 04-130

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Condensation of 3-acetyl-8-ethoxycoumarin (3) with thiosemicarbazide gave ethylidenehydrazinecarbothioamide 5, which was transformed into the thiazolidin-4-one derivatives 6,7. Interaction of 3 with DMF/POCl3 gave β-chloroacroline derivative 8. Treatment of 3 with malononitrile gave benzo[c]chromone and 2-aminobenzonitrile derivatives 9 and 10, respectively with respect to the reaction conditions. Condensation of 3-(2-bromoacetyl)-8-ethoxycoumarin (4) with o-phenylenediamine gave 3-(quioxaline-2-yl)-8-ethoxycoumarin hydrobromide (11), while 4 reacted with 2-aminopyridine to give chromenopyridopyrimidine derivative 12. Condensation of 4 with potassium thio-cyanate/methanol gave an unexpected derivative, 2H-chromeno-3-carboxy(methyl-carbonimidic)thioanhydride 16, which upon treatment with (NH2)2·H2O gave 3-ethoxy-2-hydroxybenzaldehyde azine 19. Interaction of 4 with thiourea derivatives gave thiazole derivatives 20a–c. The structures of the newly synthesized compounds were confirmed by their spectra data. The newly synthesized compounds were also screened for their antimicrobial activity.

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