Triphosgene → 5,5-Dimethyl-3-[6-(spiro[1-benzofuran-3,1'-cyclopropan]-4-yloxy)-3-pyridinyl]-2,4-imidazolidinedione

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-methyl-N1-[6-(spiro[1-benzofuran-3,1′-cyclopropan]-4-yloxy)-3-pyridinyl]alaninamide (Intermediate 91, 34 mg) in dry dichloromethane (6 mL) TEA (0.070 mL, 0.501 mmol) was added and the mixture was cooled to 0° C. A solution of triphosgene (13.38 mg, 0.045 mmol) in dry dichloromethane (2 mL) was slowly added and the reaction mixture was stirred for 1 hour at the same temperature. The reaction was quenched with water (3 ml) and two phases were separated. The organic layer was dried over sodium sulphate, filtered and evaporated. The residue was purified by flash chromatography (Biotage system) on silica gel using a 10 g SNAP column SNAP and cyclohexane/ethyl acetate 7:3 to cyclohexane/ethyl acetate 3:7 as eluents affording the title as a white solid (23 mg).

Provenance & Evidence