Hydrochloric Acid → 4-(Phenethylcarbamoyl)phenylboronic acid

HRID 897561Notes

Reaction equation

HRID 897561 reaction equation
C([Li])C[CH2:3][CH3:4].[C:6]1([NH:12][C:13](=[O:23])[C:14]2[CH:19]=[CH:18][C:17](Br)=[CH:16][C:15]=2OC)[CH:11]=[CH:10][CH:9]=[CH:8][CH:7]=1.[B:24](OC(C)C)([O:29]C(C)C)[O:25]C(C)C.Cl>O1CCCC1>[CH2:6]([NH:12][C:13]([C:14]1[CH:15]=[CH:16][C:17]([B:24]([OH:29])[OH:25])=[CH:18][CH:19]=1)=[O:23])[CH2:11][C:10]1[CH:9]=[CH:8][CH:7]=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 21531Triisopropyl borateHCID 223472094-Bromo-2-methoxy-N-phenylbenzamideHCID 178418339Butyllithium

Product 1

HCID 223469764-(Phenethylcarbamoyl)phenylboronic acidYield 28.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

n-Butyl lithium(1.6 M in hexane solution, 10 ml, 15.78 mmol) was added slowly to a solution of N1-phenyl-4-bromo-2-methoxybenzamide (1.92 g, 6.31 mmol) in tetrahydrofuran (47 mL) at −78° C. After 30 minutes, triisopropyl borate (2.2 mL, 9.47 mmol) was added rapidly. The reaction mixture was allowed to warm up to room temperature after 13 minutes and stirred for 16 hours. Hydrochloric acid (2.5N, 47 mL) was added and the mixture was stirred for 5 h hours. The layers were separated and the aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with brine, dried over MgSO4, filtered and concentrated. The residue was re-crystallized from ethyl acetate/heptane to give 4-[(phenethylamino)carbonyl]phenylboronic acid (0.486 g, 28%). 1H NMR (DMSO-d6) δ 2.85(m, 2H), 3.49(m, 2H), 7.22 (m, 5H), 7.73 (m, 4H), 8.17 (s, 2H), 8.54 (m, 1H).

Workup

  1. stirringthe mixture was stirred for 5 h hours
  2. customThe layers were separated
  3. extractionthe aqueous layer was extracted with ethyl acetate
  4. washThe combined organic layer was washed with brine
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe residue was re-crystallized from ethyl acetate/heptane

Sources & evidence

ORD record
ord-429bde9d971a4f08be3797bac506e789
Source dataset
uspto-grants-2005_07
Patent number
US06921763B2

Reaction notes

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