Abstract

An efficient, straightforward and rapid method has been developed for the synthesis of tetrahydrobenzo[α] xanthen-11-one using sodium acetate. The reaction was performed via three components: β-naphthol, dimedone with various aromatic aldehydes under solvent-free microwave irradiation and conventional heating condition. We observed an efficient result for microwave synthesis than conventional heating. The synthesized tetrahydrobenzo[α]xanthen-11-one (4a–l) was screened for their antimicrobial activity against two bacteria (Escherichia coli and Bacillus subtilis) and two fungal strains (Aspergillus niger and Saccharomyces cerevisiae). The synthesized products: 9, 10-dihydro-9, 9-dimethyl-12-(4-nitrophenyl)-8H-benzo[a]xanthen-11(12H)-one, 9, 10-dihydro-9, 9-dimethyl-12-(2, 4-dichlorophenyl)-8H-benzo[a]xanthen-11(12H)-one, 9, 10-dihydro-9, 9-dimethyl-12-(6-methyl-4-oxo-4H-chromen-3-yl)-8H-benzo[a]xanthen-11(12H)-one exhibit good antimicrobial activity. The developed protocol is graced with appealing advantages such as high purity, simple operation, excellent yields, inexpensive and easy availability of catalyst.

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