Potassium Carbonate → Ammonia

Participants

Reaction Steps

Isopropylisocyanate (0.029 ml) was added to a solution of (2S)-1-(1,3-benzoxazol-2-yl)-N2-[(cis)-2,6-dimethyl-1-piperazinyl]ethyl-2-piperidinecarboxamide (105 mg) [see Example 8] and potassium carbonate (37.5 mg) in acetonitrile (3 ml). The reaction mixture was stirred at room temperature for 5 hours, after which time the solvent was removed under reduced pressure and the residue partitioned between ethyl acetate and water. The organic layer was separated, dried over magnesium sulphate and the solvent removed under reduced pressure. The crude product was purified by column chromatography on silica gel eluting with a solvent gradient of 94.6:5.6:0.8 changing to 93:7:1, by volume, dichloromethane:methanol: 0.88 aqueous ammonia solution to afford (cis)-4-[2-([(2S)-1-(1,3-benzoxazol-2-yl)-2-piperidinyl]carbonylamino)ethyl]-N1-isopropyl-3,5-dimethyl-1-piperazinecarboxamide (72.8 mg) as a white solid.

Provenance & Evidence