Cesium carbonate → 2-{3-[4-(2,4-Dimethyl-phenyl)-piperazin-1-yl]-phenyl}-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester

HRID 1801078Notes

Reaction equation

HRID 1801078 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]([C:16]1[CH:21]=[CH:20][CH:19]=[C:18](Br)[CH:17]=1)[C:10]([CH3:24])([CH3:23])[CH2:9]2)=[O:5])[CH3:2].C(=O)([O-])[O-].[Cs+].[Cs+].Cl.[CH3:32][C:33]1[CH:38]=[C:37]([CH3:39])[CH:36]=[CH:35][C:34]=1[N:40]1[CH2:45][CH2:44][NH:43][CH2:42][CH2:41]1>C1(C)C=CC=CC=1.C([O-])(=O)C.[Pd+2].C([O-])(=O)C.CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>[CH2:1]([O:3][C:4]([C:6]1[CH:7]=[C:8]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]([C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([N:43]3[CH2:44][CH2:45][N:40]([C:34]4[CH:35]=[CH:36][C:37]([CH3:39])=[CH:38][C:33]=4[CH3:32])[CH2:41][CH2:42]3)[CH:17]=1)[C:10]([CH3:24])([CH3:23])[CH2:9]2)=[O:5])[CH3:2]

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 674424911-(2,4-DIMETHYLPHENYL)PIPERAZINE hydrochlorideHCID 674428312-(3-Bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester

Product 1

HCID 674412112-{3-[4-(2,4-Dimethyl-phenyl)-piperazin-1-yl]-phenyl}-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl esterYield 40.2%

Reagents, catalysts & solvents 3

HCID 167845palladium(II) acetateCatalystHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)CatalystHCID 1140TolueneSolvent

Conditions

Temperature
120 °C

Procedure

To a mixture of 2-(3-bromo-phenyl)-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (388 mg, 1 mmol), palladium acetate (6.73 mg, 0.03 mmol), cesium carbonate (0.65 g, 2 mmol), xantphos (23 mg, 0.04 mmol) and 1-(2,4-dimethyl-phenyl)-piperazine hydrochloride (285 mg, 1.5 mmol) in toluene (10 mL) was stirred at 120° C. for 12 hours. Then the reaction mixture was concentrated in vacuo and the residue was extracted with ethyl acetate (2×100 mL), washed with saturated aqueous sodium chloride (2×50 mL), dried over anhydrous sodium sulfate and concentrated in vacuo. Purification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company) (20% ethyl acetate/hexanes) to afford 2-{3-[4-(2,4-dimethyl-phenyl)-piperazin-1-yl]-phenyl}-3,3-dimethyl-1,2,3,4-tetrahydro-quinoline-6-carboxylic acid ethyl ester (0.20 g, 40%) as a white solid: LC/MS m/e calcd for C32H39N3O2 (M+H)+: 498.7, observed: 498.9.

Workup

  1. concentrationThen the reaction mixture was concentrated in vacuo
  2. extractionthe residue was extracted with ethyl acetate (2×100 mL)
  3. washwashed with saturated aqueous sodium chloride (2×50 mL)
  4. dry with materialdried over anhydrous sodium sulfate
  5. concentrationconcentrated in vacuo
  6. customPurification on flash silica gel chromatography (silica gel from QingDao, 200-300 mesh, glass column from Shanghai SD company) (20% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-e24e516f0e90449e8f2e5c7ab248c045
Source dataset
uspto-grants-2013_01
Patent number
US08344137B2

Reaction notes

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