Triphosgene → (5R)-3-{2-[(3,3-dimethyl-2,3-dihydro-1-benzofuran-4-yl)oxy]-5-pyrimidinyl}-5-ethyl-2,4-imidazolidinedione

Participants

Reaction Conditions

Reaction Steps

To a solution of (2R)-2-amino-N-{2-[(3,3-dimethyl-2,3-dihydro-1-benzofuran-4-yl)oxy]-5-pyrimidinyl}butanamide (Intermediate 67, 3 mg) in dry dichloromethane (0.5 ml), TEA (6.11 μL, 0.044 mmol) was added and the reaction mixture was cooled to 0° C. A solution of triphosgene (1.170 mg, 3.94 μmol) in dry dichloromethane (0.125 ml) was then added dropwise and the reaction mixture was stirred at the 0° C. for 30 minutes. The reaction was quenched with water (3 ml), and the organic phase was separated, dried over sodium sulphate, filtered and evaporated. The residue was purified by flash chromatography on silica gel using a column Isolute (1 g) and dichloromethane/methanol from 99.5:0.5 to 9:10 as eluent to afford the title compound (0.7 mg) as a white solid.

Provenance & Evidence