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

HRID 2406968Notes

Reaction equation

HRID 2406968 reaction equation
[CH3:1][CH:2]([CH3:22])[CH2:3][C@@H:4]([C:6]1[CH:11]=[CH:10][C:9]([C:12]2[CH:17]=[CH:16][C:15]([C:18]([F:21])([F:20])[F:19])=[CH:14][N:13]=2)=[CH:8][CH:7]=1)[NH2:5].F[C:24]1[CH:33]=[CH:32][C:27]([C:28]([O:30][CH3:31])=[O:29])=[CH:26][N:25]=1.P([O-])([O-])([O-])=O.[K+].[K+].[K+]>>[CH3:1][CH:2]([CH3:22])[CH2:3][C@H:4]([NH:5][C:24]1[CH:33]=[CH:32][C:27]([C:28]([O:30][CH3:31])=[O:29])=[CH:26][N:25]=1)[C:6]1[CH:7]=[CH:8][C:9]([C:12]2[CH:17]=[CH:16][C:15]([C:18]([F:21])([F:19])[F:20])=[CH:14][N:13]=2)=[CH:10][CH:11]=1

Participants

4

Reactant 3

HCID 62657Potassium Phosphate, TribasicHCID 13758765Methyl 6-fluoropyridine-3-carboxylateHCID 67980909(S)-3-methyl-1-{4-[5-(trifluoromethyl)pyridin-2-yl]phenyl}butan-1-amine

Product 1

HCID 67980888(S)-methyl 6-[(3-methyl-1-{4-[5-(trifluoromethyl)pyridin-2-yl]phenyl}butyl)amino]nicotinateYield 62.1%

Conditions

Temperature
107.5 °C

Procedure

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.

Workup

  1. customwas purged with dry nitrogen
  2. additionthen diluted with N,N-dimethylacetamide (320 ml)
  3. additionThe reaction was diluted with water (˜1.5 L)
  4. customThe aqueous portion was decanted
  5. customleaving behind a thick amorphous solid
  6. washThis material was washed with water (2×1 L)
  7. dissolutionThe resulting solid was dissolved in ethyl acetate
  8. customthe remaining water was removed via azeotropic distillation (
  9. customrotary evaporator, approximately 2×1 L ethyl acetate)
  10. stirringThe combined aqueous layers were stirred vigorously for 12 hours
  11. customresulting in the precipitation of an additional aliquot (approximately 500 mg) of the crude product that
  12. customThe crude material was purified via ISCO MPLC (SiO2, 0-75% ethyl acetate in heptane)

Sources & evidence

ORD record
ord-b5c503e486f9448da33727156dc5e82b
Source dataset
uspto-grants-2014_08
Patent number
US08809342B2

Reaction notes

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