Potassium Phosphate, Tribasic → (S)-methyl 6-[(3-methyl-1-{4-[5-(trifluoromethyl)pyridin-2-yl]phenyl}butyl)amino]nicotinate

Participants

Reaction Conditions

Reaction Steps

A mixture of crude (S)-3-methyl-1-{4-[5-(trifluoromethyl)pyridin-2-yl]phenyl}butan-1-amine (66.34 g, 192.4 mmol), methyl 6-fluoronicotinate (32.8 g, 212 mmol), and freshly pulverized and dried (150 C, vacuum oven, 12 h) tripotassium phosphate (75.6 g, 356 mmol) was purged with dry nitrogen then diluted with N,N-dimethylacetamide (320 ml). The mixture was heated to 110° C. (107-108° C. internal temperature) for 24 hours. The reaction was diluted with water (˜1.5 L) and the resulting mixture was stirred vigorously for 15 minutes. The aqueous portion was decanted, leaving behind a thick amorphous solid. This material was washed with water (2×1 L). The resulting solid was dissolved in ethyl acetate and the remaining water was removed via azeotropic distillation (rotary evaporator, approximately 2×1 L ethyl acetate). The combined aqueous layers were stirred vigorously for 12 hours resulting in the precipitation of an additional aliquot (approximately 500 mg) of the crude product that was combined with the originally recovered material. The crude material was purified via ISCO MPLC (SiO2, 0-75% ethyl acetate in heptane) to yield the product (53.0 g, 62%) as a white foam. 1H NMR (400 MHz, CDCl3, δ): 8.93 (s, 1H), 8.72 (d, J=2.0 Hz, 1H), 8.00 (d, J=8.2 Hz, 2H), 7.97 (dd, J=8.5, 2.1 Hz, 1H), 7.92 (dd, J=8.9, 2.2 Hz, 1H), 7.81 (d, J=8.4 Hz, 1H), 7.47 (d, J=8.2 Hz, 2H), 6.25 (d, J=8.8 Hz, 1H), 5.79 (d, J=6.5 Hz, 1H), 4.73-4.85 (m, 1H), 3.84 (s, 3H), 1.77-1.86 (m, 1H), 1.65-1.77 (m, 2H), 1.01 (d, J=6.1 Hz, 3H), 0.97 (d, J=6.1 Hz, 3H). MS (M+1): 444.5.

Provenance & Evidence