Trifluoroacetic acid → 1-[4-(2,6-Dinitro-phenyl)-piperazin-1-yl]-3-[5-methanesulfonyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-1-yl]-propan-2-ol

HRID 2055810Notes

Reaction equation

HRID 2055810 reaction equation
C(O[C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[C:19]([N+:20]([O-:22])=[O:21])=[CH:18][CH:17]=[CH:16][C:15]=2[N+:23]([O-:25])=[O:24])[CH2:10][CH2:9]1)=O)(C)(C)C.FC(F)(F)C(O)=O.[CH3:33][S:34]([N:37]1[CH2:42][CH2:41][C:40]2[N:43]([CH2:56][CH:57]3C[O:58]3)[N:44]=[C:45]([C:46]3[CH:51]=[CH:50][C:49]([C:52]([F:55])([F:54])[F:53])=[CH:48][CH:47]=3)[C:39]=2[CH2:38]1)(=[O:36])=[O:35]>C(Cl)Cl>[N+:23]([C:15]1[CH:16]=[CH:17][CH:18]=[C:19]([N+:20]([O-:22])=[O:21])[C:14]=1[N:11]1[CH2:10][CH2:9][N:8]([CH2:6][CH:57]([OH:58])[CH2:56][N:43]2[C:40]3[CH2:41][CH2:42][N:37]([S:34]([CH3:33])(=[O:36])=[O:35])[CH2:38][C:39]=3[C:45]([C:46]3[CH:51]=[CH:50][C:49]([C:52]([F:54])([F:55])[F:53])=[CH:48][CH:47]=3)=[N:44]2)[CH2:13][CH2:12]1)([O-:25])=[O:24]

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 120720315-methanesulfonyl-1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridineHCID 865848194-(2,6-Dinitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 101462591-[4-(2,6-Dinitro-phenyl)-piperazin-1-yl]-3-[5-methanesulfonyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-1-yl]-propan-2-olYield 85%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
25 °C

Procedure

4-(2,6-Dinitro-phenyl)-piperazine-1-carboxylic acid tert-butyl ester (220 mg, 0.63 mmol) was dissolved in 5.0 mL of CH2Cl2 and treated with 3.0 mL of trifluoroacetic acid. The reaction mixture was stirred at 25° C. for 1 h before all volatiles were removed. The solid was treated with CH2Cl2 (20 mL) and aqueous KOH (4 N, 10 mL). The organic layer was separated, dried over Na2SO4, and concentrated. The crude oil (67 mg) was dissolved in absolute EtOH (1.2 mL) and treated with 141 mg (0.35 mmol, 1.3 eq) of 5-methanesulfonyl-1-oxiranylmethyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine. The reaction mixture was refluxed at 85° C. for 3 h and then the solvent was removed. Column chromatography purification (silica, 10-20% acetone/CH2Cl2) provided 150 mg (85%) of 1-[4-(2,6-dinitro-phenyl)-piperazin-1-yl]-3-[5-methanesulfonyl-3-(4-trifluoromethyl-phenyl)-4,5,6,7-tetrahydro-pyrazolo[4,3-c]pyridin-1-yl]-propan-2-ol. TLC (silica, 10% acetone/CH2Cl2): Rf=0.3. MS (electrospray): exact mass calculated for C27H30F3N7O7S, 653.19; m/z found, 654.2 [M+H]+. 1H NMR (400 MHz, CDCl3): 7.71 (d, J=8.2 Hz, 2H), 7.64 and 7.58 (AB pattern, J=8.4 Hz, 4H), 7.20 (t, J=8.2 Hz, 1H), 4.54 (s, 2H), 4.29-4.12 (m, 2H), 3.66 (t, J=5.3 Hz, 2H), 3.70-2.95 (m, 9H), 2.91 (s, 3H), 2.67-2.32 (m, 4H).

Workup

  1. customwere removed
  2. additionThe solid was treated with CH2Cl2 (20 mL) and aqueous KOH (4 N, 10 mL)
  3. customThe organic layer was separated
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated
  6. dissolutionThe crude oil (67 mg) was dissolved in absolute EtOH (1.2 mL)
  7. temperatureThe reaction mixture was refluxed at 85° C. for 3 h
  8. customthe solvent was removed
  9. customColumn chromatography purification (silica, 10-20% acetone/CH2Cl2)

Sources & evidence

ORD record
ord-b85be3ac83a74783ae98d7895e800ae5
Source dataset
uspto-grants-2008_02
Patent number
US07332494B2

Reaction notes

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