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Trifluoroacetic acid → HCID 10167188, compound

HRID 967381
Notes
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Reaction equation

HRID 967381 reaction equation
C(O[C:6]([N:8]1[CH2:13][CH2:12][CH:11]([O:14][C:15]2[C:19]3[CH:20]=[CH:21][CH:22]=[CH:23][C:18]=3[O:17][N:16]=2)[CH2:10][CH2:9]1)=O)(C)(C)C.FC(F)(F)C(O)=O.[O:31]1C[CH:32]1[CH2:34][N:35]1[C:43]2[CH2:42][CH2:41][N:40]([C:44](=[O:46])[CH3:45])[CH2:39][C:38]=2[C:37]([C:47]2[CH:52]=[CH:51][C:50]([C:53]([F:56])([F:55])[F:54])=[CH:49][CH:48]=2)=[N:36]1>C(Cl)Cl>[O:17]1[C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][C:19]=2[C:15]([O:14][CH:11]2[CH2:10][CH2:9][N:8]([CH2:6][CH:32]([OH:31])[CH2:34][N:35]3[C:43]4[CH2:42][CH2:41][N:40]([C:44](=[O:46])[CH3:45])[CH2:39][C:38]=4[C:37]([C:47]4[CH:52]=[CH:51][C:50]([C:53]([F:56])([F:55])[F:54])=[CH:49][CH:48]=4)=[N:36]3)[CH2:13][CH2:12]2)=[N:16]1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

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 691580111,1-Dimethylethyl 4-(1,2-benzisoxazol-3-yloxy)-1-piperidinecarboxylate

Product 1

HCID 10167188HCID 10167188, compoundYield 68.5%

Reagents, catalysts & solvents 1

HCID 6344
Dichloromethane
Solvent

Conditions

Temperature
60 °C

Procedure

A solution of 176 mg (0.55 mmol) of 4-(benzo[d]isoxazol-3-yloxy)-piperidine-1-carboxylic acid tert-butyl ester in CH2Cl2(2 mL) was treated with trifluoroacetic acid (0.5 mL) at room temperature overnight. The solvent was then removed and the crude product dissolved in methanol and stirred over 100 mg of sodium bicarbonate for 1 h, the solid was then filtered off and the filtrate concentrated. The crude piperidine was then dissolved in 4 mL EtOH and treated with 202 mg (0.55 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 220 mg (68%) of a white solid. MS (electrospray): exact mass calculated for C30H32F3N5O4, 583.24. m/z found, 584.2 [M+H]+. 1H NMR (CDCl3, 400 MHz, a mixture of amide rotamers): 7.77 (d, J=8.22 Hz, 1H), 7.69 (m, 2H), 7.66-7.61 (m, 2H), 7.54-7.49 (m, 1H), 7.41 (d, J=8.41 Hz, 1H), 7.28-7.23 (m, 1H), 4.93 (br m, 1H), 4.88 and 4.75 (A and B of AB quartet, J=15.65 Hz, 1H), 4.65 (br s, 1H), 4.24-4.18 (m, 0.75H), 4.18-4.09 (m, 1.25H), 4.07-3.98 (m, 1.5H), 3.91-3.79 (m, 0.5H), 3.79-3.67 (m, 1H), 3.02-2.85 (m, 2.4H), 2.85-2.70 (m, 1.6H), 2.61-2.52 (m, 1H), 2.51-2.40 (m, 2H), 2.39-2.30 (m, 1H), 2.24-2.12 (br m, 2H), 2.20 (s, 1.5H), 2.16 (s, 1.5H), 2.02-1.86 (m, 2H).

Workup

  1. customThe solvent was then removed
  2. dissolutionthe crude product dissolved in methanol
  3. filtrationthe solid was then filtered off
  4. concentrationthe filtrate concentrated
  5. dissolutionThe crude piperidine 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-88eac109bc274db691ccd68ccd665dc6
Source dataset
uspto-grants-2005_10
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US06953793B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes