Trifluoroacetic acid → 1-[1-[3-(4-Benzo[d]isoxazol-3-yl-piperazin-1-yl)-2-hydroxy-propyl]-3-(4-trifluoromethyl-phenyl)-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanone

HRID 500978Notes

Reaction equation

HRID 500978 reaction equation
C(O[C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:18]3[CH:19]=[CH:20][CH:21]=[CH:22][C:17]=3[O:16][N:15]=2)[CH2:10][CH2:9]1)=O)(C)(C)C.FC(F)(F)C(O)=O.[O:30]1C[CH:31]1[CH2:33][N:34]1[C:42]2[CH2:41][CH2:40][N:39]([C:43](=[O:45])[CH3:44])[CH2:38][C:37]=2[C:36]([C:46]2[CH:51]=[CH:50][C:49]([C:52]([F:55])([F:54])[F:53])=[CH:48][CH:47]=2)=[N:35]1>C(Cl)Cl>[O:16]1[C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=2[C:14]([N:11]2[CH2:10][CH2:9][N:8]([CH2:6][CH:31]([OH:30])[CH2:33][N:34]3[C:42]4[CH2:41][CH2:40][N:39]([C:43](=[O:45])[CH3:44])[CH2:38][C:37]=4[C:36]([C:46]4[CH:51]=[CH:50][C:49]([C:52]([F:55])([F:54])[F:53])=[CH:48][CH:47]=4)=[N:35]3)[CH2:13][CH2:12]2)=[N:15]1

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 222938171-[1-Oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanoneHCID 592523164-Benzo[d]isoxazol-3-yl-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 101206231-[1-[3-(4-Benzo[d]isoxazol-3-yl-piperazin-1-yl)-2-hydroxy-propyl]-3-(4-trifluoromethyl-phenyl)-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanoneYield 68.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
60 °C

Procedure

A solution of 82 mg (0.27 mmol) of 4-benzo[d]isoxazol-3-yl-piperazine-1-carboxylic acid tert-butyl ester in 2 mL of CH2Cl2 was treated with trifluoroacetic acid (0.5 mL) at room temperature overnight. The solvent was then removed and the crude product dissolved in EtOH and stirred over 100 mg of sodium bicarbonate for 1 h, the solid was then filtered off and the filtrate concentrated. The crude piperazine was then dissolved in 4 mL EtOH and treated with 100 mg (0.27 mmol) of 1-[1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-1,4,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-5-yl]-ethanone. The solution was heated to 60° C. overnight. The solvent was then removed by rotary evaporation and the crude product was purified by column chromatography (silica, 0-10% MeOH/EtOAc) to afford 105 mg (68%) of a white solid. MS (electrospray), exact mass calculated for C29H31F3N6O3, 568.24; m/z found, 569.2 [M+H]+. 1H NMR (CDCl3, 400 MHz, a mixture of amide rotamers): 7.77 (d, J=8.41 Hz, 1H), 7.69 (m, 2H), 7.67-7.62 (m, 2H), 7.50-7.44 (m, 1H), 7.45-7.42 (m, 1H), 7.23-7.18 (m, 1H), 4.93 (br m, 1H), 4.87 and 4.75 (A and B of AB quartet, J=15.65 Hz, 1H), 4.65 (br s, 1H), 4.27-4.15 (m, 2.3H), 4.09-3.95 (m, 1.7H), 3.91-3.82 (m, 0.7H), 3.81-3.66 (m, 1.3H), 3.62-3.49 (m, 4H), 3.01-2.85 (m, 1.5H), 2.85-2.74 (m, 2.5H), 2.71-2.60 (m, 2H), 2.58-2.45 (m, 2H), 2.20 (s, 1.5H), 2.15 (s, 1.5H).

Workup

  1. customThe solvent was then removed
  2. dissolutionthe crude product dissolved in EtOH
  3. filtrationthe solid was then filtered off
  4. concentrationthe filtrate concentrated
  5. dissolutionThe crude piperazine was then dissolved in 4 mL EtOH
  6. customThe solvent was then removed by rotary evaporation
  7. customthe crude product was purified by column chromatography (silica, 0-10% MeOH/EtOAc)

Sources & evidence

ORD record
ord-174387914b364400827cabd4ebabd27e
Source dataset
uspto-grants-2010_08
Patent number
US07772236B2

Reaction notes

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