Diisopropylethylamine → HCID 67025902, compound

Participants

Reaction Steps

To a solution of 4,4,4-trifluorobutyric acid (43 mg, 0.304 mmol) in NMP (1 ml) was added at ambient temperature 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (89 mg, 0.28 mmol) and N,N-diisopropyl ethyl amine (130 μl, 0.760 mmol). After stirring for 15 min a solution {4-[(3SR,4RS)-3-(3,4-dichloro-phenyl)-4-methylamino-pyrrolidine-1-carbonyl]-piperidin-1-yl}-(1-methyl-cyclopropyl)-methanone (111 mg, 0.253 mmol) in NMP (1 mL) was added and stirred for 18 h at ambient temperature. The reaction mixture was diluted with ethyl acetate (15 mL) and washed with aqueous sodium carbonate (1 M, 15 mL), water (15 mL) and brine (15 mL). The aqueous layers were extracted with ethyl acetate (15 mL) and the combined organic layers were dried over sodium sulfate. Purification by chromatography (SiO2, heptane:ethyl acetate:methanol=20:80:0 to 0:85:15) afforded the title compound (109 mg, 77%) as an off-white foam. MS m/e: 562.2 [M]+.

Provenance & Evidence