Hydrochloric Acid → HCID 18706394, compound

Participants

Reaction Conditions

Reaction Steps

12.9 g (36.8 mmol) of 7-chloro-2,3-dimethoxy-5-iodo-quinoxaline, 7.6 ml (128.4 mmol) of propargyl alcohol, 2.1 g (3 mmol) of bis(triphenylphosphine)-palladium dichloride, 6.6 ml (47.4 mmol) of triethylamine and 0.34 g (1.8 mmol) of cuprous iodide are placed in 125 ml of dimethylformamide and heated to a bath temperature of 70° C. The reaction mixture is then stirred for 3.5 hours at that temperature and then cooled to room temperature. Ethyl acetate is added to the reaction mixture and extraction is carried out with water, 1N hydrochloric acid and brine. The aqueous phases are washed with ethyl acetate. The organic phases are combined, dried over sodium sulfate, filtered with suction and concentrated. Chromatography of the crude product on silica gel with hexane/ethyl acetate (3:1) yields 1.1 g of 3-(7-chloro-2,3-dimethoxy-quinoxalin-5-yl)-prop-2-yn-1-ol in the form of brown crystals having a melting point of 137-140° C.

Provenance & Evidence