Borane;tetrahydrofuran → (R)-4-(4-((2-(tert-butyldiphenylsilyloxy)ethyl)(ethyl)amino)-1-(phenylthio)butan-2-ylamino)-3-(trifluoromethylsulfonyl)benzenesulfonamide

HRID 1771174Notes

Reaction equation

HRID 1771174 reaction equation
[Si:1]([O:18][CH2:19][CH2:20][N:21]([CH2:52][CH3:53])[C:22](=O)[CH2:23][C@@H:24]([NH:33][C:34]1[CH:39]=[CH:38][C:37]([S:40](=[O:43])(=[O:42])[NH2:41])=[CH:36][C:35]=1[S:44]([C:47]([F:50])([F:49])[F:48])(=[O:46])=[O:45])[CH2:25][S:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)([C:14]([CH3:17])([CH3:16])[CH3:15])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.B.C1COCC1>C1COCC1.N.CO>[Si:1]([O:18][CH2:19][CH2:20][N:21]([CH2:52][CH3:53])[CH2:22][CH2:23][C@@H:24]([NH:33][C:34]1[CH:39]=[CH:38][C:37]([S:40]([NH2:41])(=[O:42])=[O:43])=[CH:36][C:35]=1[S:44]([C:47]([F:49])([F:50])[F:48])(=[O:45])=[O:46])[CH2:25][S:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][CH:28]=1)([C:14]([CH3:16])([CH3:15])[CH3:17])([C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1)[C:8]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=1

Participants

6

Reactant 2

HCID 2723981Borane;tetrahydrofuran2×HCID 66723918(R)-N-(2-(tert-Butyldiphenylsilyloxy)ethyl)-N-ethyl-4-(phenylthio)-3-(4-sulfamoyl-2-(trifluorom ethylsulfonyl)phenylamino)butanamide2×

Product 1

HCID 66723539(R)-4-(4-((2-(tert-butyldiphenylsilyloxy)ethyl)(ethyl)amino)-1-(phenylthio)butan-2-ylamino)-3-(trifluoromethylsulfonyl)benzenesulfonamideYield 48.3%

Reagents, catalysts & solvents 3

HCID 222AmmoniaSolventHCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent

Procedure

(R)—N-(2-(tert-Butyldiphenylsilyloxy)ethyl)-N-ethyl-4-(phenylthio)-3-(4-sulfamoyl-2-(trifluoromethylsulfonyl)phenylamino)butanamide (INTERMEDIATE 24, 0.59 g, 0.73 mmol) was dissolved in THF (4.6 ml), under a nitrogen atmosphere, and a solution of borane-THF complex (1M in THF; 2.2 ml, 2.2 mmol) was added and the resulting solution was stirred at ambient temperature overnight. An additional solution of borane-THF complex (1M in THF; 2.2 ml, 2.2 mmol) was added. The resulting mixture was stirred at ambient for further 6 hrs. The mixture was diluted with NH3 in MeOH (7N, 20 ml) and stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure, diluted with EtOAc (75 ml), washed with water (40 ml), and dried (Na2SO4). Evaporation of the volatiles under reduced pressure afforded a concentrate, which was purified by column chromatography (ISCO, 40 g silica gel column, eluting with 0→100% EtOAc/hexanes) to provide the title compound (280 mg, yield: 48%).

Workup

  1. stirringThe resulting mixture was stirred at ambient for further 6 hrs
  2. stirringstirred at room temperature overnight
  3. concentrationThe reaction mixture was concentrated under reduced pressure
  4. additiondiluted with EtOAc (75 ml)
  5. washwashed with water (40 ml)
  6. dry with materialdried (Na2SO4)
  7. customEvaporation of the volatiles under reduced pressure
  8. customafforded a concentrate, which
  9. customwas purified by column chromatography (ISCO, 40 g silica gel column, eluting with 0→100% EtOAc/hexanes)

Sources & evidence

ORD record
ord-6319a21e3c5b49afb50b84a31807277f
Source dataset
uspto-grants-2016_02
Patent number
US09248140B2

Reaction notes

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