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note
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3 (0.250 g, 1.81 mmol) was added to the reaction mixture at 0 °C and the reaction mixture was allowed to stir at room temperature for 1 h. After completion of the reaction as analyzed by TLC, it was diluted with saturated sodium thiosulphate solution and extracted with EtOAc (20 mL × 3). The organic layer was washed with brine (10 mL), dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The crude product so obtained was purified on a silica gel column using hexane: ethyl acetate (1:9, v/v) as eluent to afford dihydro-α-carbolines 4. General procedure for the one-pot three-component tandem reaction leading to the synthesis of 3-iodo-α-carbolines 5: To a solution of 2-ethoxycarbonylamino-indole-1-carboxylic acid ethyl ester 1a (0.200 g, 0.73 mmol) and 1-(4-chloro-phenyl)-3-phenyl-prop-2-yn-1-ol 2a (0.175 g, 0.73 mmol) in acetonitrile (10 ml), iodine (0.920 g, 3.62 mmol) was added and stirred for 0.5 h at 0 °C to rt. Next, ICl (1 M solution in DCM, 3.4 ml) was added to the reaction mixture at 0 °C and the reaction mixture was allowed to stir at room temperature for 1 h. After completion of the reaction as analyzed by TLC, it was diluted with saturated sodium thiosulphate solution and extracted with EtOAc (20 mL × 3). The organic layer was washed with brine (10 mL), dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The crude product so obtained was purified on a silica gel column using hexane: ethyl acetate (1:19, v/v) as eluent to afford α-carbolines 5.
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Yadav, J.S.6
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