N-bromobutanimide → N-{2-Chloro-3-[5-(2-chloro-4-pyrimidinyl)-2-(tetrahydro-2H-pyran-4-yl)-1,3-thiazol-4-yl]phenyl}-2,6-difluorobenzenesulfonamide

HRID 1961795Notes

Reaction equation

HRID 1961795 reaction equation
C1C(=O)N(Br)C(=O)C1.[Cl:9][C:10]1[C:15](/[C:16](/O)=[CH:17]\[C:18]2[CH:23]=[CH:22][N:21]=[C:20]([Cl:24])[N:19]=2)=[CH:14][CH:13]=[CH:12][C:11]=1[NH:26][S:27]([C:30]1[C:35]([F:36])=[CH:34][CH:33]=[CH:32][C:31]=1[F:37])(=[O:29])=[O:28].[O:38]1[CH2:43][CH2:42][CH:41]([C:44](=[S:46])[NH2:45])[CH2:40][CH2:39]1>CC(N(C)C)=O.O>[Cl:9][C:10]1[C:15]([C:16]2[N:45]=[C:44]([CH:41]3[CH2:42][CH2:43][O:38][CH2:39][CH2:40]3)[S:46][C:17]=2[C:18]2[CH:23]=[CH:22][N:21]=[C:20]([Cl:24])[N:19]=2)=[CH:14][CH:13]=[CH:12][C:11]=1[NH:26][S:27]([C:30]1[C:35]([F:36])=[CH:34][CH:33]=[CH:32][C:31]=1[F:37])(=[O:29])=[O:28]

Participants

6

Reactant 3

HCID 67184N-bromobutanimideHCID 13197204Oxane-4-carbothioamideHCID 136342910N-{2-chloro-3-[(E)-2-(2-chloro-4-pyrimidinyl)-1-hydroxyethenyl]phenyl}-2,6-difluorobenzenesulfonamide

Product 1

HCID 57989796N-{2-Chloro-3-[5-(2-chloro-4-pyrimidinyl)-2-(tetrahydro-2H-pyran-4-yl)-1,3-thiazol-4-yl]phenyl}-2,6-difluorobenzenesulfonamideYield 50.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 31374DimethylacetamideSolvent

Procedure

Recrystallized NBS (1.56 g, 8.8 mmol) was added to a suspension of N-{2-chloro-3-[(E)-2-(2-chloro-4-pyrimidinyl)-1-hydroxyethenyl]phenyl}-2,6-difluorobenzenesulfonamide (4.02 g, 8.80 mmol) in DMA (15 mL) in an ice-bath. The reaction was immediately removed from the ice bath and allowed to warm to rt over 0.5 h. Tetrahydro-2H-pyran-4-carbothioamide (1.27 g, 8.80 mmol) was added and the reaction warmed in an oil bath (rt to 65° C.). The reaction was diluted with water (100 mL) which caused the precipitation of a yellow solid. The solid was then dissolved by the addition of EtOAc (100 mL) and the phases separated. The aqueous phase was extracted with EtOAc (50 mL). The combined organic phase was filtered through Whatman 1 PS (phase separating) paper and concentrated under vacuum to a crude orange residue. The residue was purified by silica gel chromatography eluting with 0-100% EtOAc/hexanes to give the title compound of Step A as a bright yellow solid (2.56 g; 50.1% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 10.88 (s, 1H), 8.55 (d, J=5.4 Hz, 1H), 7.62-7.74 (m, 1H), 7.48-7.57 (m, 2H), 7.42-7.47 (m, 1H), 7.22 (t, J=9.1 Hz, 2H), 6.54 (d, J=5.3 Hz, 1H), 3.92 (d, J=11.0 Hz, 2H), 3.41-3.51 (m, 2H), 2.03 (br. s., 2H), 1.69-1.83 (m, J=12.1, 12.1, 11.9, 4.2 Hz, 2H).

Workup

  1. customThe reaction was immediately removed from the ice bath
  2. temperaturethe reaction warmed in an oil bath (rt to 65° C.)
  3. customthe precipitation of a yellow solid
  4. dissolutionThe solid was then dissolved by the addition of EtOAc (100 mL)
  5. customthe phases separated
  6. extractionThe aqueous phase was extracted with EtOAc (50 mL)
  7. filtrationThe combined organic phase was filtered through Whatman 1 PS (phase separating) paper
  8. concentrationconcentrated under vacuum to a crude orange residue
  9. customThe residue was purified by silica gel chromatography
  10. washeluting with 0-100% EtOAc/hexanes

Sources & evidence

ORD record
ord-a6749fafb32e4b62aae2e442c2b78ce2
Source dataset
uspto-grants-2013_04
Patent number
US08415345B2

Reaction notes

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