1-Chloro-4-isocyanato-2-(trifluoromethyl) benzene → Sorafenib

HRID 1916510Notes

Reaction equation

HRID 1916510 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]=[C:9]=[O:10])=[CH:4][C:3]=1[C:11]([F:14])([F:13])[F:12].[CH3:15][NH:16][C:17]([C:19]1[CH:24]=[C:23]([O:25][C:26]2[CH:32]=[CH:31][C:29]([NH2:30])=[CH:28][CH:27]=2)[CH:22]=[CH:21][N:20]=1)=[O:18]>C(Cl)Cl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9]([NH:30][C:29]2[CH:28]=[CH:27][C:26]([O:25][C:23]3[CH:22]=[CH:21][N:20]=[C:19]([C:17](=[O:18])[NH:16][CH3:15])[CH:24]=3)=[CH:32][CH:31]=2)=[O:10])=[CH:4][C:3]=1[C:11]([F:12])([F:13])[F:14]

Participants

4

Reactant 2

HCID 27332651-Chloro-4-isocyanato-2-(trifluoromethyl) benzeneHCID 166551294-(4-Aminophenoxy)-N-methylpicolinamide

Product 1

HCID 216239Sorafenib

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

4-Chloro-N-methyl-2-pyridinecarboxamide is first synthesized from 4-chloropyridine-2-carbonyl chloride by adding 4-chloropyridine-2-carbonyl chloride HCl salt (7.0 g, 32.95 mmol) in portions to a mixture of a 2.0 M methylamine solution in THF (100 mL) and MeOH (20 mL) at 0° C. The resulting mixture is stored at 3° C. for 4 h, then concentrated under reduced pressure. The resulting nearly dry solids are suspended in EtOAc (100 mL) and filtered. The filtrate is washed with a saturated NaCl solution (2×100 mL), dried (Na2SO4) and concentrated under reduced pressure to provide 4-chloro-N-methyl-2-pyridinecarboxamide as a yellow, crystalline solid. Step 2: A solution of 4-aminophenol (9.60 g, 88.0 mmol) in anh. DMF (150 mL) is treated with potassium tert-butoxide (10.29 g, 91.7 mmol), and the reddish-brown mixture is stirred at room temp. for 2 h. The contents are treated with 4-chloro-N-methyl-2-pyridinecarboxamide (15.0 g, 87.9 mmol) from Step 1 and K2CO3 (6.50 g, 47.0 mmol) and then heated at 80° C. for 8 h. The mixture is cooled to room temp. and separated between EtOAc (500 mL) and a saturated NaCl solution (500 mL). The aqueous phase is back-extracted with EtOAc (300 mL). The combined organic layers are washed with a saturated NaCl solution (4×1000 mL), dried (Na2SO4) and concentrated under reduced pressure. The resulting solids are dried under reduced pressure at 35° C. for 3 h to afford 4-(2-(N-methylcarbamoyl)-4-pyridyloxy)aniline as a light-brown solid. 1H-NMR (DMSO-d6) δ 2.77 (d, J=4.8 Hz, 3H), 5.17 (br s, 2H), 6.64, 6.86 (AA′BB′ quartet, J=8.4 Hz, 4H), 7.06 (dd, J=5.5, 2.5 Hz, 1H), 7.33 (d, J=2.5 Hz, 1H), 8.44 (d, J=5.5 Hz, 1H), 8.73 (br d, 1H); HPLC ES-MS m/z 244 ((M+H)+). Step 3: A solution of 4-chloro-3-(trifluoromethyl)phenyl isocyanate (14.60 g, 65.90 mmol) in CH2Cl2 (35 mL) is added dropwise to a suspension of 4-(2-(N-methylcarbamoyl)-4-pyridyloxy)aniline from Step 2; (16.0 g, 65.77 mmol) in CH2Cl2 (35 mL) at 0° C. The resulting mixture is stirred at room temp. for 22 h. The resulting yellow solids are removed by filtration, then washed with CH2Cl2 (2×30 mL) and dried under reduced pressure (approximately 1 mmHg) to afford N-(4-chloro-3-(trifluoromethyl)phenyl)-N′-(4-(2-(N-methylcarbamoyl)-4-pyridyloxy)phenyl)urea as an off-white solid: mp 207-209° C.; 1H-NMR (DMSO-d6) δ 2.77 (d, J=4.8 Hz, 3H), 7.16 (m, 3H), 7.37 (d, J=2.5 Hz, 1H), 7.62 (m, 4H), 8.11 (d, J=2.5 Hz, 1H), 8.49 (d, J=5.5 Hz, 1H), 8.77 (br d, 1H), 8.99 (s, 1H), 9.21 (s, 1H); HPLC ES-MS m/z 465 ((M+H)+).

Workup

  1. customat 0° C
  2. customThe resulting yellow solids are removed by filtration
  3. washwashed with CH2Cl2 (2×30 mL)
  4. customdried under reduced pressure (approximately 1 mmHg)

Sources & evidence

ORD record
ord-bd40097261a843f7b3ea473013d78017
Source dataset
uspto-grants-2013_12
Patent number
US08618141B2

Reaction notes

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