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Hydrochloric Acid → 4-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]benzoic acid

HRID 1508682
Notes
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Reaction equation

HRID 1508682 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([C:8]2[N:13]=[C:12]3[CH2:14][CH2:15][CH2:16][C:11]3=[C:10]([NH:17][C:18]3[CH:27]=[CH:26][C:21]([C:22]([O:24]C)=[O:23])=[CH:20][CH:19]=3)[CH:9]=2)[CH:5]=[CH:6][CH:7]=1.[Li+].[OH-].O.C1COCC1.Cl>CO.O>[Cl:1][C:2]1[CH:3]=[C:4]([C:8]2[N:13]=[C:12]3[CH2:14][CH2:15][CH2:16][C:11]3=[C:10]([NH:17][C:18]3[CH:19]=[CH:20][C:21]([C:22]([OH:24])=[O:23])=[CH:26][CH:27]=3)[CH:9]=2)[CH:5]=[CH:6][CH:7]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 8028TetrahydrofuranHCID 168937Lithium hydroxide, monohydrateHCID 90109954US11401286, Example 87

Product 1

HCID 742209084-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]benzoic acidYield 25%

Reagents, catalysts & solvents 2

HCID 887
Methanol
Solvent
HCID 962WaterSolvent

Procedure

An 18-mL vial was charged with methyl 4-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]benzoate (20 mg, 0.053 mmol, 1 eq.) and LiOH/H2O (47.4 mg, 1.13 mmol, 21 eq.). THF (1 ml), H2O (0.3 ml) and MeOH (0.2 ml) was added to the vial. The resulting mixture was stirred at room temperature overnight. 2 N HCl aq. (0.5 ml) was added and the volatile material was removed under reduced pressure. The residue was purified by chromatography on silica gel using 5% of methanol in dichloromethane as eluent to give 4-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]benzoic acid (4.8 mg, 25% yield). MW=364.82. 1H NMR (DMSO-D6, 360 MHz) δ 8.65 (s, 1H), 7.96 (s, 1H), 7.86 (m, 3H), 7.42 (m, 3H), 7.25 (d, J=8.31 Hz, 2H), 2.92 (t, J=7.86, 2H), 2.82 (t, J=6.93, 2H), 2.06 (m, 2H).

Workup

  1. customthe volatile material was removed under reduced pressure
  2. customThe residue was purified by chromatography on silica gel using 5% of methanol in dichloromethane as eluent

Sources & evidence

ORD record
ord-3789b2ad21314af6a978074623795fc0
Source dataset
uspto-grants-2015_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US09221843B2

Reaction notes

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