Pyridine → 5-(6-Acetoxy-2.5,7,8-tetramethvlchroman-2-carboxamido)-6-amino-3-methyl-1-phenyl-2,4 (1H, 3H)-pyrimidinedione

Participants

Reaction Steps

The compound of Example 1 (1.77 g, 3.80 mmol) and pyridine (0.154 mL, 1.90 mmol) were dissolved in dichloromethane (30 mL). To the resultant solution was added dropwise acetic anhydride (0.714 mL, 7.60 mmol) under ice cooling. The resultant reaction mixture was stirred overnight at room temperature, washed with 1N hydrochloric acid and 10% aqueous solution of sodium chloride successively, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was suspended in ethyl acetate and filtered to give the title compound (yield 87%).

Provenance & Evidence