Triphosgene → (5R)-5-ethyl-3-{6-[(3-ethyl-1,2-benzisoxazol-4-yl)oxy]-3-pyridinyl}-2,4-imidazolidinedione

Participants

Reaction Conditions

Reaction Steps

(2R)-2-amino-N-{6-[(3-ethyl-1,2-benzisoxazol-4-yl)oxy]-3-pyridinyl}butanamide (Intermediate 35) was dissolved in dichloromethane (1.0 ml) and TEA (0.004 ml, 0.03 mmol) was added. The reaction mixture was cooled down to 0° C. and triphosgene (1.3 mg, 4.49 μmol) dissolved in 0.1 ml of dichloromethane was added. The reaction mixture was stirred at that temperature for 30 minutes. The mixture was quenched with 0.5 ml of water and water was removed by addition of sodium sulphate. The organic phase was pipetted off and evaporated and the crude obtained was charged on a silica gel column (Biotage SP1 system) and eluted with Cyhexane/EtOAv (from 1/0 to 7/3, then 7/3, then from 7/3 to 1/1, the 1/1, then from 1/1 to 0/1) to afford the title compound (1.3 mg).

Provenance & Evidence