Potassium Carbonate → HCID 57517767, compound

Participants

Reaction Conditions

Reaction Steps

Potassium tert-butoxide (1.21 g, 10.8 mmol) was added to an ice-cold solution of the intermediate from step A (3.00 g, 10.8 mmol) in DMF (30 ml), and the mixture was stirred at 0° C. for 30 min. After addition of 2,4-dimethoxy-benzenesulfonyl chloride (2.5 g, 10.8 mmol), the reaction mixture was left to stir at 0° C. for 1 hour. Further addition of 0.2 equivalent each of potassium tert-butoxide and sulfonyl chloride led to no further advance in the reaction according to thin-layer chromatography. The reaction mixture was stirred into dilute potassium carbonate solution, and the resulting precipitate was filtered off. The precipitate was taken up in ethyl acetate, and the extract was washed with saturated brine and dried over magnesium sulfate. Purification by chromatography (silica gel, gradient 30% to 50% ethyl acetate in heptane) and recrystallization from diethyl ether resulted in 0.96 g of the desired product.

Provenance & Evidence