Hydrochloric Acid → HCID 59134416, compound

Participants

Reaction Steps

To a solution of (3R*,4S*)-4,6,7-triamino-2,2-dimethyl-3,4-dihydro-2H-1-benzopyran-3-ol (280 mg, 1.25 mmol) in ethanol (5.6 mL), 40% aqueous glyoxal solution (226 mg, 1.56 mmol) was added, and the resulting mixture was stirred at room temperature for 1 hour. Upon the completion of the reaction, 1 mol/L hydrochloric acid was added thereto, the resulting solution was washed with ethyl acetate, the resulting aqueous phase was adjusted to pH 14 with 1 mol/L aqueous sodium hydroxide solution. Then, the resulting solution was extracted with ethyl acetate, washed with saturated sodium chloride solution, and dried over magnesium sulfate and concentrated. The resulting mixture was purified by silica gel column (ethyl acetate/methanol=10/1) to obtain the aimed product (yield: 35%).

Provenance & Evidence