Water → 5-Ethyl-1-(phenylsulfonyl)indoline

HRID 1847470Notes

Reaction equation

HRID 1847470 reaction equation
[BH4-].[Na+].[C:3]1([S:9]([N:12]2[C:20]3[C:15](=[CH:16][C:17]([C:21](=O)[CH3:22])=[CH:18][CH:19]=3)[CH2:14][CH2:13]2)(=[O:11])=[O:10])[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.O.[OH-].[Na+]>C(O)(C(F)(F)F)=O>[CH2:21]([C:17]1[CH:16]=[C:15]2[C:20](=[CH:19][CH:18]=1)[N:12]([S:9]([C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1)(=[O:11])=[O:10])[CH2:13][CH2:14]2)[CH3:22]

Participants

6

Reactant 4

HCID 962WaterHCID 14798Sodium HydroxideHCID 4311764Sodium borohydrideHCID 141129561-(1-Benzenesulfonyl-2,3-dihydro-1H-indol-5-yl)-ethanone

Product 1

HCID 141129525-Ethyl-1-(phenylsulfonyl)indolineYield 47%

Reagents, catalysts & solvents 1

HCID 6422Trifluoroacetic acidSolvent2×

Conditions

Temperature
25 °C

Procedure

To TFA (1600 mL) at 0° C. was added sodium borohydride (64.0 g, 1.69 mol) over 1 h. To this mixture was added dropwise a solution of 1-(1-(phenylsulfonyl)indolin-5-yl)ethanone (40.0 g, 0.133 mol) in TFA (700 mL) over 1 h. The mixture was then stirred overnight at 25° C. After dilution with H2O (1600 mL), the mixture was made basic by the addition of sodium hydroxide pellets at 0° C. The organic layer was separated and the aqueous layer was extracted with CH2Cl2. The combined organic layers were washed with brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified by silica column to give 5-ethyl-1-(phenylsulfonyl)indoline (16.2 g, 47% over two steps).

Workup

  1. customThe organic layer was separated
  2. extractionthe aqueous layer was extracted with CH2Cl2
  3. washThe combined organic layers were washed with brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by silica column

Sources & evidence

ORD record
ord-f6ad74eec3e94cee9c852d127b8d8bb3
Source dataset
uspto-grants-2015_02
Patent number
US08952050B2

Reaction notes

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