Lithium Hydroxide → {(3S)-7-Bromo-4-[(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-6-yl)carbonyl]-3,4-dihydro-2H-1,4-benzoxazin-3-yl}acetic acid

HRID 1054180Notes

Reaction equation

HRID 1054180 reaction equation
[Br:1][C:2]1[CH:30]=[CH:29][C:5]2[N:6]([C:16]([C:18]3[CH:19]=[CH:20][C:21]4[O:26][CH2:25][C:24](=[O:27])[NH:23][C:22]=4[CH:28]=3)=[O:17])[C@@H:7]([CH2:10][C:11]([O:13]CC)=[O:12])[CH2:8][O:9][C:4]=2[CH:3]=1.[OH-].[Li+].CCOC(C)=O>C1COCC1.O>[Br:1][C:2]1[CH:30]=[CH:29][C:5]2[N:6]([C:16]([C:18]3[CH:19]=[CH:20][C:21]4[O:26][CH2:25][C:24](=[O:27])[NH:23][C:22]=4[CH:28]=3)=[O:17])[C@@H:7]([CH2:10][C:11]([OH:13])=[O:12])[CH2:8][O:9][C:4]=2[CH:3]=1

Participants

6

Reactant 3

HCID 3939Lithium HydroxideHCID 8857Ethyl AcetateHCID 118599611Ethyl 2-[(3S)-7-bromo-4-(3-oxo-4H-1,4-benzoxazine-6-carbonyl)-2,3-dihydro-1,4-benzoxazin-3-yl]acetate2×

Product 1

HCID 118599730{(3S)-7-Bromo-4-[(3-oxo-3,4-dihydro-2H-1,4-benzoxazin-6-yl)carbonyl]-3,4-dihydro-2H-1,4-benzoxazin-3-yl}acetic acidYield 98%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

Ethyl 2-[(3S)-7-bromo-4-(3-oxo-4H-1,4-benzoxazine-6-carbonyl)-2,3-dihydro-1,4-benzoxazin-3-yl]acetate (Intermediate 28a, 173 mg, 0.37 mmol) was dissolved in THF (1.5 mL). Lithium hydroxide (52.5 mg, 2.19 mmol) dissolved in water (1.50 mL) was added. The reaction was stirred at rt for 2 h before addition of EtOAc (50 mL). The organic layer was washed with HCl (1M, 30 mL) and brine (30 mL). Dried through a phase separator and evaporated under reduced pressure. The title compound (160 mg, 98%) was obtained crude and used without further purification.

Workup

  1. additionwas added
  2. washThe organic layer was washed with HCl (1M, 30 mL) and brine (30 mL)
  3. customDried through a phase separator
  4. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-e973a738fd9d4afdb7229777ddf1a825
Source dataset
uspto-grants-2016_07
Patent number
US09394291B2

Reaction notes

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