Diisopropylethylamine → N-(2-tert-butoxycarbonylamino-5-trifluoromethyl-phenyl)-malonamic acid benzyl ester

HRID 1766849Notes

Reaction equation

HRID 1766849 reaction equation
[C:1]([O:5][C:6](=[O:19])[NH:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]([F:17])([F:16])[F:15])=[CH:10][C:9]=1[NH2:18])([CH3:4])([CH3:3])[CH3:2].[C:20]([O:26][CH2:27][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)(=[O:25])[CH2:21][C:22]([O-])=[O:23].C(N(CC)C(C)C)(C)C.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>C(Cl)Cl.CN(C=O)C>[CH2:27]([O:26][C:20](=[O:25])[CH2:21][C:22]([NH:18][C:9]1[CH:10]=[C:11]([C:14]([F:17])([F:16])[F:15])[CH:12]=[CH:13][C:8]=1[NH:7][C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:19])=[O:23])[C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1

Participants

6

Reactant 4

HCID 81531DiisopropylethylamineHCID 9886157Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)HCID 22247814Benzyl malonateHCID 24689211tert-butyl N-(2-amino-4-(trifluoromethyl)phenyl)carbamate

Product 1

HCID 68617235N-(2-tert-butoxycarbonylamino-5-trifluoromethyl-phenyl)-malonamic acid benzyl esterYield 77%

Reagents, catalysts & solvents 1

HCID 22350042dichloromethane N,N-dimethylformamideSolvent

Procedure

The compound (2-amino-4-trifluoromethyl-phenyl)-carbamic acid tert-butyl ester (1.8 g, 6.6 mmol, see procedure 4a) was dissolved in 32 mL of 2:1 CH2Cl2/DMF. The resultant solution was charged sequentially with mono-benzyl malonate (1.28 g, 6.6 mmol), N,N-diisopropylethylamine (5.8 mL, 33 mmol) and HATU (3.0 g, 7.9 mmol). The mixture was stirred for 12 h at RT, concentrated in vacuo, and partitioned between EtOAc and sat. NH4Cl. The aqueous phase was extracted with EtOAc (1×). The combined organic extracts were washed with sat. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The residue was purified by flash chromatography to provide N-(2-tert-butoxycarbonylamino-5-trifluoromethyl-phenyl)-malonamic acid benzyl ester (2.3 g, 77% yield). A portion (860 mg) of this material was dissolved in 10 mL of THF. The resultant solution was charged with 30 mL of acetic acid, heated at 65° C. for 3 h, and concentrated in vacuo. The residue was purified by flash chromatography to provide (5-trifluoromethyl-1H-benzoimidazol-2-yl)-acetic acid benzyl ester (343 mg, 54% yield). MS found: (M+H)+=335.2.

Workup

  1. concentrationconcentrated in vacuo
  2. custompartitioned between EtOAc and sat. NH4Cl
  3. extractionThe aqueous phase was extracted with EtOAc (1×)
  4. washThe combined organic extracts were washed with sat. NaHCO3 and brine
  5. dry with materialdried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by flash chromatography

Sources & evidence

ORD record
ord-1274b2c2dcbf472c9689add6a18046d0
Source dataset
uspto-grants-2007_06
Patent number
US07230133B2

Reaction notes

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