Hexachloroethane → tert-butyl [(1S)-2-{[5-fluoro-6-(6-hydroxy-1,3-benzoxazol-2-yl)pyridin-3-yl]oxy}-1-methylethyl]carbamate

HRID 1026327Notes

Reaction equation

HRID 1026327 reaction equation
C(N(CC)CC)C.ClC(Cl)(Cl)C(Cl)(Cl)Cl.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[OH:35][C:36]1[CH:41]=[C:40]([OH:42])[CH:39]=[CH:38][C:37]=1[NH:43][C:44]([C:46]1[N:51]=[CH:50][C:49]([O:52][CH2:53][C@@H:54]([NH:56][C:57](=[O:63])[O:58][C:59]([CH3:62])([CH3:61])[CH3:60])[CH3:55])=[CH:48][C:47]=1[F:64])=O>C(#N)C.O>[F:64][C:47]1[CH:48]=[C:49]([O:52][CH2:53][C@@H:54]([NH:56][C:57](=[O:63])[O:58][C:59]([CH3:61])([CH3:60])[CH3:62])[CH3:55])[CH:50]=[N:51][C:46]=1[C:44]1[O:35][C:36]2[CH:41]=[C:40]([OH:42])[CH:39]=[CH:38][C:37]=2[N:43]=1

Participants

7

Reactant 4

HCID 6214HexachloroethaneHCID 8471TriethylamineHCID 11776TriphenylphosphineHCID 86666268tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate

Product 1

HCID 136372365tert-butyl [(1S)-2-{[5-fluoro-6-(6-hydroxy-1,3-benzoxazol-2-yl)pyridin-3-yl]oxy}-1-methylethyl]carbamateYield 210.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6342AcetonitrileSolvent2×

Procedure

Triethylamine (14.1 mL) was added to a solution of hexachloroethane (7.46 g) and triphenylphosphine (9.91 g) in acetonitrile (50 mL) at room temperature, and the mixture was stirred at room temperature for 10 min. Then a mixture of tert-butyl [(1S)-2-({6-[(2,4-dihydroxyphenyl)carbamoyl]-5-fluoropyridin-3-yl}oxy)-1-methylethyl]carbamate (5.31 g) and acetonitrile (50 mL) was added, and the mixture was stirred at room temperature for 2 hr. Water was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give tert-butyl [(1S)-2-{[5-fluoro-6-(6-hydroxy-1,3-benzoxazol-2-yl)pyridin-3-yl]oxy}-1-methylethyl]carbamate (10.7 g) as a mixture with impurities. A mixture of [(1S)-2-{[5-fluoro-6-(6-hydroxy-1,3-benzoxazol-2-yl)pyridin-3-yl]oxy}-1-methylethyl]carbamate (4.28 g, a mixture with impurities), (2,2-difluorocyclopropyl)methyl methanesulfonate (0.494 g), potassium carbonate (0.367 g), and DMF (30 mL) was stirred at 60° C. for 1 hr. Then additional (2,2-difluorocyclopropyl)methyl methanesulfonate (0.494 g) and potassium carbonate (0.367 g) were added, and the mixture was stirred at 60° C. for 1 hr. Then additional (2,2-difluorocyclopropyl)methyl methanesulfonate (0.494 g) and potassium carbonate (0.367 g) were added, and the mixture was stirred at 60° C. for 1 hr. Water was added, and the mixture was extracted with ethyl acetate. The organic layer was separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (1.39 g) as a pale yellow solid.

Workup

  1. additionwas added
  2. stirringthe mixture was stirred at room temperature for 2 hr
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe organic layer was washed with brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate)

Sources & evidence

ORD record
ord-07413ea248454be786970c827bb4d7b0
Source dataset
uspto-grants-2014_05
Patent number
US08729102B2

Reaction notes

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