Benzenesulfonyl chloride → 5-(Phenylmethoxy)-1-phenylsulfonylindole

HRID 913394Notes

Reaction equation

HRID 913394 reaction equation
[C:1]1([CH2:7][O:8][C:9]2[CH:10]=[C:11]3[C:15](=[CH:16][CH:17]=2)[NH:14][CH:13]=[CH:12]3)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:18]1([S:24](Cl)(=[O:26])=[O:25])[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.[OH-].[Na+]>C1(C)C=CC=CC=1.[Br-].C([N+](CCCC)(CCCC)CCCC)CCC.O>[C:1]1([CH2:7][O:8][C:9]2[CH:10]=[C:11]3[C:15](=[CH:16][CH:17]=2)[N:14]([S:24]([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)(=[O:26])=[O:25])[CH:13]=[CH:12]3)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1

Participants

7

Reactant 3

HCID 7369Benzenesulfonyl chloride2×HCID 146245-BenzyloxyindoleHCID 14798Sodium Hydroxide

Product 1

HCID 118246245-(Phenylmethoxy)-1-phenylsulfonylindoleYield 87.3%

Reagents, catalysts & solvents 3

HCID 74236Tetrabutylammonium BromideCatalystHCID 962WaterSolventHCID 1140TolueneSolvent

Procedure

To a suspension of 5-[(phenylmethyl)oxy]-1H-indole (10 g, 44.78 mmol) in toluene (100 mL) was added benzenesulfonyl chloride (9.1 g, 51.5 mmol), tetrabutylammonium bromide (1.44 g, 4.48 mmol) and a solution of NaOH (23 g, 582 mmol) in 100 mL of water. The mixture was rapidly stirred at rt. After 30 min, additional benzenesulfonyl chloride (0.97 g, 5.5 mmol) was added and stirred for another 30 min. The mixture was partitioned between Et2O and water. The aqueous phase was extracted with Et2O. The combined organic phases were washed with water and sat'd brine, dried (Na2SO4) and concentrated in vacuo. The residue was purified by flash chromatography (0-30% EtOAc-hexanes gradient) to afford the title compound (14.2 g, 87% yield): 1H NMR (400 MHz, CDCl3) δ 7.89 (d, J=9.0 Hz, 1H), 7.85 (d, J=7.6 Hz, 2H), 7.53-7.50 (m, 2H), 7.44-7.29 (m, 7H), 7.03 (d, J=2.4 Hz, 1H), 7.0 (dd, J=9.0, 2.4 Hz, 1H), 6.57 (d, J=3.7 Hz, 1H), 5.05 (s, 2H); MS (ES) m/z 364 (M+1).

Workup

  1. stirringstirred for another 30 min
  2. customThe mixture was partitioned between Et2O and water
  3. extractionThe aqueous phase was extracted with Et2O
  4. washThe combined organic phases were washed with water
  5. dry with materialdried (Na2SO4)
  6. concentrationconcentrated in vacuo
  7. customThe residue was purified by flash chromatography (0-30% EtOAc-hexanes gradient)

Sources & evidence

ORD record
ord-e3af8b1154cc47029e7116b505a142ae
Source dataset
uspto-grants-2011_09
Patent number
US08026262B2

Reaction notes

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