Cesium fluoride → benzyl (2-methyl-1-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)propan-2-yl)carbamate

HRID 924308Notes

Reaction equation

HRID 924308 reaction equation
Br[C:2]1[N:6]=[CH:5][N:4]([C:7]2[CH:12]=[CH:11][C:10]([O:13][C:14]([F:17])([F:16])[F:15])=[CH:9][CH:8]=2)[N:3]=1.[CH3:18][C:19]([NH:37][C:38](=[O:47])[O:39][CH2:40][C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1)([CH3:36])[CH2:20][C:21]1[CH:26]=[CH:25][C:24](B2OC(C)(C)C(C)(C)O2)=[CH:23][CH:22]=1.F[B-](F)(F)F.C([PH+](C(C)(C)C)C(C)(C)C)(C)(C)C.[F-].[Cs+]>O1CCOCC1.O.[Cl-].[Na+].O.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH3:36][C:19]([NH:37][C:38](=[O:47])[O:39][CH2:40][C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1)([CH3:18])[CH2:20][C:21]1[CH:26]=[CH:25][C:24]([C:2]2[N:6]=[CH:5][N:4]([C:7]3[CH:12]=[CH:11][C:10]([O:13][C:14]([F:17])([F:16])[F:15])=[CH:9][CH:8]=3)[N:3]=2)=[CH:23][CH:22]=1

Participants

8

Reactant 4

HCID 25953Cesium fluorideHCID 2734635Tri-tert-butylphosphine tetrafluoroborateHCID 712094283-bromo-1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazoleHCID 90438188Benzyl(2-methyl-1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propan-2-yl)carbamate

Product 1

HCID 90438210benzyl (2-methyl-1-(4-(1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazol-3-yl)phenyl)propan-2-yl)carbamateYield 16.3%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 218864351,4-Dioxane--water (1/1)SolventHCID 57417360Sodium chloride; waterSolvent

Conditions

Temperature
70 °C

Procedure

A mixture of 3-bromo-1-(4-(trifluoromethoxy)phenyl)-1H-1,2,4-triazole (C1) (4.28 g, 13.9 mmol), benzyl (2-methyl-1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propan-2-yl)carbamate (CB7) (6.12 g, 15.0 mmol), tri-tert-butylphosphonium tetrafluoroborate (0.390 g, 1.40 mmol), palladium(II) acetate (0.150 g, 0.680 mmol), and cesium fluoride (4.34 g, 28.6 mmol) in dioxane/water (4:1, 90 mL) was heated at 70° C. overnight. The reaction was cooled and diluted with brine and extracted with ethyl acetate (2×). The organic layer was dried over sodium sulfate, filtered, and concentrated. Purification by flash column chromatography using 0-100% ethyl acetate/hexanes as eluent provided the title compound as a clear oil (1.16 g, 15%): 1H NMR (400 MHz, CDCl3) δ 8.57 (s, 1H), 8.06 (d, J=8.2 Hz, 2H), 7.81 (d, J=9.0 Hz, 2H), 7.44-7.32 (m, 7H), 7.19 (d, J=8.2 Hz, 2H), 5.12 (s, 2H), 4.56 (s, 1H), 3.05 (s, 2H), 1.33 (s, 6H); 19F NMR (376 MHz, CDCl3) δ −58.02; ESIMS m/z 511 ([M+H]+).

Workup

  1. temperatureThe reaction was cooled
  2. extractionextracted with ethyl acetate (2×)
  3. dry with materialThe organic layer was dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customPurification by flash column chromatography

Sources & evidence

ORD record
ord-25184daceb91480da7a87d2abc8cc9d0
Source dataset
uspto-grants-2016_03
Patent number
US09278964B2

Reaction notes

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