Add time:09/25/2019 Source:sciencedirect.com
4-(Bromomethyl) coumarins 1 have been reacted with vanillins, 2 and 2A to obtain the corresponding ethers 3 and 5. Ethers 3 have been reacted with ethyl cyanoacetate to obtain the unsaturated esters 4. Ethers 5 have been converted to the corresponding 4-(2′-benzo[b] furanyl) coumarins 6 by an intramolecular aldol condensation. Eight compounds have been screened for their anti-inflammatory activity. Out of these the 5,6-benzo-4-2′-benzo[b]furanyl) coumarin (6c) and the aryloxymethyl coumarin (4) with p-formyl group were found to be most active.
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