Synthesis and antibacterial activity of some new fused chromenes

General Papers ARKIVOC 2007 (xvi) 83-91 O O Ph O O 1 O Ph O O NC OEt O O O O NC NCCH2COOEt EtOH/Pip. S h 2 NCCHCOOEt O Ph O O NC O O Ph OH O NC O C COOEt CN O Ph O NC O CN COOEt H O Ph O NC O COOEt O Ph O NC OH COOEt 3 base Ph Scheme 2 The structure of product 3 was supported by IR and 1H-NMR data. (See Experimental Section). Similar treatment of compound 1 with a series of compounds possessing active methylene groups in refluxing ethanol under basic conditions afforded the pyranochromene and chromenopyridine heterocycles 4-6. ISSN 1551-7012 Page 85 ©ARKAT USA, Inc. 0