2-(T-Butyldimethylsilyloxy)-4-bromoanisole → 5-{[3-(Tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-hydroxy-methyl}-2-chloro-benzenesulfonamide

HRID 873637Notes

Reaction equation

HRID 873637 reaction equation
Br[C:2]1[CH:3]=[CH:4][C:5]([O:16][CH3:17])=[C:6]([CH:15]=1)[O:7][Si:8]([C:11]([CH3:14])([CH3:13])[CH3:12])([CH3:10])[CH3:9].C([Li])(C)(C)C.[Cl:23][C:24]1[CH:29]=[CH:28][C:27]([CH:30]=[O:31])=[CH:26][C:25]=1[S:32]([NH2:35])(=[O:34])=[O:33]>O1CCCC1>[C:11]([Si:8]([CH3:10])([CH3:9])[O:7][C:6]1[CH:15]=[C:2]([CH:30]([OH:31])[C:27]2[CH:28]=[CH:29][C:24]([Cl:23])=[C:25]([S:32]([NH2:35])(=[O:33])=[O:34])[CH:26]=2)[CH:3]=[CH:4][C:5]=1[O:16][CH3:17])([CH3:14])([CH3:13])[CH3:12]

Participants

5

Reactant 3

HCID 109800492-(T-Butyldimethylsilyloxy)-4-bromoanisoleHCID 146546022-Chloro-5-formylbenzene-1-sulfonamideHCID 178418306HCID 178418306, compound

Product 1

HCID 581074595-{[3-(Tert-butyl-dimethyl-silanyloxy)-4-methoxy-phenyl]-hydroxy-methyl}-2-chloro-benzenesulfonamideYield 59%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
-78 °C

Procedure

To a solution of (5-bromo-2-methoxy-phenoxy)-tert-butyl-dimethyl-silane (2 g, 6.32 mmol) dissolved in tetrahydrofuran (25 mL) at −78° C. under nitrogen is dropwisely added 1.7 M of tert-butyllithium (8.06 mL, 12.6 mmol). The reaction mixture is stirred at −78° C. for 5 minutes. Then, the solution of 2-chloro-5-formyl-benzenesulfonamide (0.462 g, 2.11 mmol) in tetrahydrofuran (5 mL) is added slowly. The reaction mixture is warmed up to room temperature and stirred for 24 h. The reaction is quenched with 1 N of HCl, and extracted with ethyl acetate three times. The combined organic extracts are washed with a saturated sodium chloride solution, dried with magnesium sulfate, and concentrated in vacuo. Purification by silica gel chromatography (50% ethyl acetate-hexane) provides 0.57 g (59%) of the title compound as a brown oil. 1H NMR (CDCl3): δ 8.00 (m, 1H), 7.40 (m, 2H), 6.70 (d, 3H), 5.70 (s, 1H), 5.00 (m, 2H), 3.70 (s, 3H), 0.90 (s, 9H), 0.05 (s, 6H).

Workup

  1. temperatureThe reaction mixture is warmed up to room temperature
  2. stirringstirred for 24 h
  3. customThe reaction is quenched with 1 N of HCl
  4. extractionextracted with ethyl acetate three times
  5. washThe combined organic extracts are washed with a saturated sodium chloride solution
  6. dry with materialdried with magnesium sulfate
  7. concentrationconcentrated in vacuo
  8. customPurification by silica gel chromatography (50% ethyl acetate-hexane)

Sources & evidence

ORD record
ord-452b85766ff94495913b95db3ab3cd76
Source dataset
uspto-grants-2015_03
Patent number
US08975439B2

Reaction notes

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