Tributylphosphine → ethyl 7-[(2,2-difluoroethyl)(pyridin-2-ylsulfonyl)amino]-5-(2-methoxyethoxy)-1H-indole-2-carboxylate

HRID 1960440

Reaction equation

HRID 1960440 reaction equation
[CH3:1][O:2][CH2:3][CH2:4][O:5][C:6]1[CH:7]=[C:8]2[C:12](=[C:13]([NH:15][S:16]([C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=3)(=[O:18])=[O:17])[CH:14]=1)[NH:11][C:10]([C:25]([O:27][CH2:28][CH3:29])=[O:26])=[CH:9]2.[F:30][CH:31]([F:34])[CH2:32]O.C(P(CCCC)CCCC)CCC.N(C(N1CCCCC1)=O)=NC(N1CCCCC1)=O>C1(C)C=CC=CC=1>[F:30][CH:31]([F:34])[CH2:32][N:15]([S:16]([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=1)(=[O:17])=[O:18])[C:13]1[CH:14]=[C:6]([O:5][CH2:4][CH2:3][O:2][CH3:1])[CH:7]=[C:8]2[C:12]=1[NH:11][C:10]([C:25]([O:27][CH2:28][CH3:29])=[O:26])=[CH:9]2

Participants

6

Reactant 4

HCID 13831TributylphosphineHCID 730421,1'-(Azodicarbonyl)dipiperidineHCID 1361872,2-Difluoroethan-1-olHCID 57476206ethyl 5-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylate

Product 1

HCID 57476249ethyl 7-[(2,2-difluoroethyl)(pyridin-2-ylsulfonyl)amino]-5-(2-methoxyethoxy)-1H-indole-2-carboxylateYield 37%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

To a mixture of ethyl 5-(2-methoxyethoxy)-7-[(pyridin-2-ylsulfonyl)amino]-1H-indole-2-carboxylate (500 mg), 2,2-difluoroethanol (0.09 mL), tributylphosphine (0.59 mL) and toluene (30 mL) was added 1,1′-(azodicarbonyl)dipiperidine (600 mg), and the mixture was stirred at room temperature overnight. The insoluble substance was filtered off, and the filtrate was diluted with ethyl acetate and 1N aqueous hydrochloric acid solution. The organic layer was washed with aqueous sodium bicarbonate solution and saturated brine, dried over anhydrous magnesium sulfate, and filtered, and the filtrate was concentrated under reduced pressure. The residue was subjected to basic silica gel column chromatography to give the title compound (211 mg, yield 37%) as a colorless amorphous solid from a fraction eluted with ethyl acetate-hexane (1:4, volume ratio).

Workup

  1. filtrationThe insoluble substance was filtered off
  2. additionthe filtrate was diluted with ethyl acetate and 1N aqueous hydrochloric acid solution
  3. washThe organic layer was washed with aqueous sodium bicarbonate solution and saturated brine
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationfiltered
  6. concentrationthe filtrate was concentrated under reduced pressure

Sources & evidence

ORD record
ord-370627d1dafd44d3928a2a6f45e09438
Source dataset
uspto-grants-2013_04
Patent number
US08410087B2

Linked notes

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