3-(4-Hydroxyphenyl)propionic acid → N-ethyl-N-(2-fluorobenzyl)-3-(4-hydroxyphenyl)propanamide

HRID 899901Notes

Reaction equation

HRID 899901 reaction equation
[F:1][C:2]1[CH:11]=[CH:10][CH:9]=[CH:8][C:3]=1[CH2:4][NH:5][CH2:6][CH3:7].[OH:12][C:13]1[CH:18]=[CH:17][C:16]([CH2:19][CH2:20][C:21](O)=[O:22])=[CH:15][CH:14]=1.F[B-](F)(F)F.N1(OC(N(C)C)=[N+](C)C)C2C=CC=CC=2N=N1.C(N(C(C)C)C(C)C)C>CN(C=O)C.CCOC(C)=O>[CH2:6]([N:5]([CH2:4][C:3]1[CH:8]=[CH:9][CH:10]=[CH:11][C:2]=1[F:1])[C:21](=[O:22])[CH2:20][CH2:19][C:16]1[CH:17]=[CH:18][C:13]([OH:12])=[CH:14][CH:15]=1)[CH3:7]

Participants

7

Reactant 4

HCID 103943-(4-Hydroxyphenyl)propionic acidHCID 81531DiisopropylethylamineHCID 2733207O-(Benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborateHCID 4719442Ethyl[(2-fluorophenyl)methyl]amine

Product 1

HCID 69120618N-ethyl-N-(2-fluorobenzyl)-3-(4-hydroxyphenyl)propanamideYield 81.1%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
0 °C

Procedure

N-(2-Fluorobenzyl)ethanamine (0.554 g, 3.615 mmol) was dissolved in DMF (10 ml). 3-(4-hydroxyphenyl)propanoic acid (0.546 g, 3.286 mmol) was added and the mixture was cooled to 0° C. N-[(1H-1,2,3-benzotriazol-1-yloxy)(dimethylamino)-methylene]-N-methylmethanaminium tetrafluoroborate (1.161 g, 3.615 mmol) and N-ethyl-N,N-diisopropylamine (0.892 g, 6.901 mmol) was added. The solution was stirred overnight at room temperature. EtOAc (20 ml) was added and the organic phase was washed with two portions of Na2CO3 (2×20 ml, aq). The organic layer was dried (MgSO4) and the solvent was removed by evaporation. The crude was purified by preparative HPLC (starting with isocratic acetonitrile/buffer 60/40 and then the acetonitrile concentration was increased to 100%, the buffer was a mixture of acetonitrile/water 10/90 and ammonium acetate (0.1 M, column KR-100-7-C8, 50 mm×250 mm, flow 40 ml/min). The product-containing fractions were pooled and the acetonitrile was removed by evaporation. EtOAc (10 ml) was added and the organic phase was washed with two portions of brine and dried (MgSO4) and then solvent was removed by evaporation to give 0.803 g of N-ethyl-N-(2-fluorobenzyl)-3-(4-hydroxyphenyl)propanamide (yield 81.1%).

Workup

  1. washthe organic phase was washed with two portions of Na2CO3 (2×20 ml, aq)
  2. dry with materialThe organic layer was dried (MgSO4)
  3. customthe solvent was removed by evaporation
  4. customThe crude was purified by preparative HPLC (
  5. concentrationthe acetonitrile concentration
  6. temperaturewas increased to 100%
  7. additiona mixture of acetonitrile/water 10/90 and ammonium acetate (0.1 M, column KR-100-7-C8, 50 mm×250 mm, flow 40 ml/min)
  8. customthe acetonitrile was removed by evaporation
  9. additionEtOAc (10 ml) was added
  10. washthe organic phase was washed with two portions of brine
  11. dry with materialdried (MgSO4)
  12. customsolvent was removed by evaporation

Sources & evidence

ORD record
ord-9d83a8e085604a688877b861f765ff08
Source dataset
uspto-grants-2008_04
Patent number
US07355069B2

Reaction notes

Loading…