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Part 130 in the series 'Studies on novel synthetic methodologies'.
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Part 130 in the series 'Studies on novel synthetic methodologies'.
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General Procedure for the Synthesis of 12-Aryl- or 12-Alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one Derivatives: NaHSO4·SiO2 (100 mg) was added to a mixture of 2-naphthol (1.0 mmol, aldehyde (1.0 mmol) and dimedone (1.2 mmol) in DCE (5 mL, The mixture was stirred at reflux conditions and the reaction was monitored by TLC. After completion of the reaction, the mixture was filtered. The filtrate was concentrated and the residue was purified by column chromatography (silica gel, 3% EtOAc in hexane) to afford the pure 12-aryl- or 12-alkyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one derivative. Spectral data of some representative products are given below: Compound 3b: 1H NMR (200 MHz, CDCl3, δ, 7.86 (dd, J, 2.0, 8.0 Hz, 1 H, 7.75 (dd, J, 2.0, 8.0 Hz, 2 H, 7.11-7.46 (m, 7 H, 5.62 (s, 1 H, 2.63 (s, 2 H, 2.31 (d, J, 12.0 Hz, 1 H, 2.20 d, J, 12.0 Hz, 1 H
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