7-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1,4-dicarboxylic acid 1-isopropyl ester 4-methyl ester → 7-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl ester

HRID 2353911Notes

Reaction equation

HRID 2353911 reaction equation
COC([CH:5]1[CH2:11][CH2:10][N:9]([C:12]([O:14][CH:15]([CH3:17])[CH3:16])=[O:13])[C:8]2[CH:18]=[C:19]([Cl:23])[C:20]([Br:22])=[CH:21][C:7]=2[C:6]1=[O:24])=O>CC(O)=O.Cl.O>[CH:15]([O:14][C:12]([N:9]1[CH2:10][CH2:11][CH2:5][C:6](=[O:24])[C:7]2[CH:21]=[C:20]([Br:22])[C:19]([Cl:23])=[CH:18][C:8]1=2)=[O:13])([CH3:17])[CH3:16]

Participants

5

Reactant 1

HCID 686781067-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1,4-dicarboxylic acid 1-isopropyl ester 4-methyl ester

Product 1

HCID 686772987-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl esterYield 80.3%

Reagents, catalysts & solvents 3

HCID 176Acetic AcidSolventHCID 313Hydrochloric AcidSolventHCID 962WaterSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of 7-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1,4-dicarboxylic acid 1-isopropyl ester 4-methyl ester (1.43 g, 3.42 mmol) in HOAc (30.0 ml), concentrated HCl (9.00 ml) and water (3.00 ml) was heated at 100° C. for 4 hours and then cooled down to room temperature overnight. The solvents were evaporated under reduced pressure, and the residue was partitioned between ethyl acetate (100 ml) and saturated NaHCO3 (aq) (100 ml). The aqueous layer was extracted with more ethyl acetate (20.0 ml). The combined organics washed with brine (3×120 ml), dried over Na2SO4, filtered and concentrated. The material obtained was subjected to the conditions described in step 2 to provide 7-Bromo-8-chloro-5-oxo-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid isopropyl ester (0.990 g, 80%) as white solid. MS (ES+): 360, 362 (M+H).

Workup

  1. temperaturecooled down to room temperature overnight
  2. customThe solvents were evaporated under reduced pressure
  3. customthe residue was partitioned between ethyl acetate (100 ml) and saturated NaHCO3 (aq) (100 ml)
  4. extractionThe aqueous layer was extracted with more ethyl acetate (20.0 ml)
  5. washThe combined organics washed with brine (3×120 ml)
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe material obtained

Sources & evidence

ORD record
ord-560fa6d66b474124ac5ae55ed3aad339
Source dataset
uspto-grants-2010_07
Patent number
US07749992B2

Reaction notes

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