Hydrogen Bromide → 4-(2-Chloro-4-methylphenylcarbamoyl)-3-[4-cyclopropyl-5-(3-isobutylcyclobutyl)isoxazol-3-yl]butanoic acid

HRID 1912059Notes

Reaction equation

HRID 1912059 reaction equation
[Cl:1][C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[CH:4][C:3]=1[NH:9][C:10]([CH2:12][CH:13]([C:22]1[C:26]([CH:27]2[CH2:29][CH2:28]2)=[C:25]([CH:30]2[CH2:33][CH:32]([CH2:34][CH:35]([CH3:37])[CH3:36])[CH2:31]2)[O:24][N:23]=1)[CH2:14][C:15]([O:17]C(C)(C)C)=[O:16])=[O:11].O.Br.C([O-])(=O)C.[Na+]>C(O)(=O)C>[Cl:1][C:2]1[CH:7]=[C:6]([CH3:8])[CH:5]=[CH:4][C:3]=1[NH:9][C:10]([CH2:12][CH:13]([C:22]1[C:26]([CH:27]2[CH2:28][CH2:29]2)=[C:25]([CH:30]2[CH2:31][CH:32]([CH2:34][CH:35]([CH3:37])[CH3:36])[CH2:33]2)[O:24][N:23]=1)[CH2:14][C:15]([OH:17])=[O:16])=[O:11]

Participants

6

Reactant 4

HCID 260Hydrogen BromideHCID 962Water2×HCID 517045Sodium AcetateHCID 71134796tert-Butyl 4-(2-chloro-4-methylphenylcarbamoyl)-3-[4-cyclopropyl-5-(3-isobutylcyclobutyl)isoxazol-3-yl]butanoate

Product 1

HCID 711147514-(2-Chloro-4-methylphenylcarbamoyl)-3-[4-cyclopropyl-5-(3-isobutylcyclobutyl)isoxazol-3-yl]butanoic acidYield 83.1%

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Procedure

tert-Butyl 4-(2-chloro-4-methylphenylcarbamoyl)-3-[4-cyclopropyl-5-(3-isobutylcyclobutyl)isoxazol-3-yl]butanoate (131 mg) and water (0.8 mL) were mixed. After an addition of 25 w/w % hydrogen bromide in acetic acid (1.64 mL) to the reaction mixture, the mixture was stirred at RT for 1.5 hr. Sodium acetate and water were added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, then dried over sodium sulfate. The sodium sulfate was filtered off and the filtrate was concentrated in vacuo. The resultant residue was purified by preparative chromatography (Eluent: methanol/chloroform=1/9) to give the title compound (97.3 mg). The specific optical rotation value of the title compound was [α]D25=+32.7° (c=1.00, methanol). The title compound was analyzed using a chiral column. The retention time of the title compound was 6.8 min., and the optical purity thereof was 95.1% ee. The condition for the analysis using the chiral column was as follows:

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe organic layer was washed with water and brine
  3. dry with materialdried over sodium sulfate
  4. filtrationThe sodium sulfate was filtered off
  5. concentrationthe filtrate was concentrated in vacuo
  6. customThe resultant residue was purified by preparative chromatography (Eluent: methanol/chloroform=1/9)

Sources & evidence

ORD record
ord-e61b234aaf1c4f80859902583f307a42
Source dataset
uspto-grants-2013_12
Patent number
US08604069B2

Reaction notes

Loading…