Water → Methyl 1-Acetyl-4-(4-hydroxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzodiazepine-3-carboxylate

HRID 1180560Notes

Reaction equation

HRID 1180560 reaction equation
[C:1]([N:4]1[C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=2[CH2:8][N:7]([S:15]([C:18]2[CH:23]=[CH:22][C:21]([O:24]C)=[CH:20][CH:19]=2)(=[O:17])=[O:16])[CH:6]([C:26]([O:28][CH3:29])=[O:27])[CH2:5]1)(=[O:3])[CH3:2].B(Br)(Br)Br.O>C(Cl)Cl>[C:1]([N:4]1[C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=2[CH2:8][N:7]([S:15]([C:18]2[CH:23]=[CH:22][C:21]([OH:24])=[CH:20][CH:19]=2)(=[O:17])=[O:16])[CH:6]([C:26]([O:28][CH3:29])=[O:27])[CH2:5]1)(=[O:3])[CH3:2]

Participants

5

Reactant 3

HCID 962WaterHCID 25134Boron tribromideHCID 18612735HCID 18612735, compound

Product 1

HCID 18612782Methyl 1-Acetyl-4-(4-hydroxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzodiazepine-3-carboxylateYield 33.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a 0° C. solution of methyl 1-acetyl-4-(4-methoxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzodiazepine-3-carboxylate (9.8 g, 23.42 mmol) in methylene chloride (50 ml) was added, dropwise, a 1.0 molar solution of boron tribromide (51.52 ml, 51.52 mmol) in methylene chloride and the mixture was stirred overnight at room temperature. Ice and water were added to the reaction mixture and the insolubles filtered off. The filtrate was diluted with methylene chloride and water. The organic layer was separated, washed with saturated sodium chloride and dried over anhydrous sodium sulfate. The solvent was removed in vacuo to give a crude product, which was purified by chromatography on silica gel (hexane:ethyl acetate (I:1)) to give 3.2 g of product as a white foam.

Workup

  1. filtrationthe insolubles filtered off
  2. additionThe filtrate was diluted with methylene chloride and water
  3. customThe organic layer was separated
  4. washwashed with saturated sodium chloride
  5. dry with materialdried over anhydrous sodium sulfate
  6. customThe solvent was removed in vacuo
  7. customto give a crude product, which
  8. customwas purified by chromatography on silica gel (hexane:ethyl acetate (I:1))

Sources & evidence

ORD record
ord-fc38c17b31f94de080cc30040653c89a
Source dataset
uspto-grants-2007_10
Patent number
US07282496B2

Reaction notes

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