Dimethyl Sulfoxide → 4-[1-Benzyl-4-(3-methoxy-phenyl)-piperidin-4-yl]-benzoic acid methyl ester

HRID 2085455Notes

Reaction equation

HRID 2085455 reaction equation
[CH2:1]([N:8]1[CH2:13][CH2:12][C:11]([C:22]2[CH:27]=[CH:26][C:25](OS(C(F)(F)F)(=O)=O)=[CH:24][CH:23]=2)([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([O:20][CH3:21])[CH:15]=2)[CH2:10][CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.CS(C)=[O:38].C(N(CC)CC)C.C1(P(C2C=CC=CC=2)CCCP(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH2:76]([O:78][CH2:79]C)C>CO.C([O-])(=O)C.[Pd+2].C([O-])(=O)C>[CH3:76][O:78][C:79](=[O:38])[C:25]1[CH:24]=[CH:23][C:22]([C:11]2([C:14]3[CH:19]=[CH:18][CH:17]=[C:16]([O:20][CH3:21])[CH:15]=3)[CH2:12][CH2:13][N:8]([CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[CH2:9][CH2:10]2)=[CH:27][CH:26]=1

Participants

8

Reactant 5

HCID 679Dimethyl SulfoxideHCID 3283Diethyl EtherHCID 8471TriethylamineHCID 812191,3-Bis(diphenylphosphino)propaneHCID 54436264Trifluoro-methanesulfonic acid 4-[1-benzyl-4-(3-methoxy-phenyl)piperidin-4-yl]-phenyl ester

Product 1

HCID 538358404-[1-Benzyl-4-(3-methoxy-phenyl)-piperidin-4-yl]-benzoic acid methyl esterYield 85%

Reagents, catalysts & solvents 2

HCID 167845palladium(II) acetateCatalystHCID 887MethanolSolvent

Conditions

Temperature
70 °C

Procedure

To a solution of trifluoro-methanesulfonic acid 4-[1-benzyl-4-(3-methoxy-phenyl)-piperidin-4-yl]-phenyl ester (10.0 g, 19.8 mmol) in a Parr pressure bottle in MeOH (69 mL) were added DMSO (62 mL) and triethylamine (21.8 mL, 157 mmol). To the reaction mixture were added palladium acetate (2.2 g, 9.1 mmol) and 1,3-bis(diphenylphosphino)propane (3.75 g, 9.1 mmol). The mixture was shaken under 40 psi of CO at 70° C. for 4 hours. The reaction mixture was cooled to room temperature and was diluted with diethyl ether (600 mL). The ether layer was washed with water (5×60 mL), dried (MgSO4) and concentrated. The crude residue was purified by flash chromatography with hexanes/EtOAc (1:1) to afford 6.9 g (85% yield) of 4-[1-Benzyl-4-(3-methoxy-phenyl)-piperidin-4-yl]-benzoic acid methyl ester. 1HNMR (400 MHz, CDCl3) δ 7.91 (d, 2H), 7.32 (d, 2H), 7.28-7.16 (comp, 6H),), 6.82 (d, , 1H), 6.79 (s, 1H), 6.68 (dd, 1H), 3.86 (s, 3H), 3.74 (s, 3H), 3.38 (s, 2H), 2.47-2.44 (comp, 8H); MS (M+1) 416.2.

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. washThe ether layer was washed with water (5×60 mL)
  3. dry with materialdried (MgSO4)
  4. concentrationconcentrated
  5. customThe crude residue was purified by flash chromatography with hexanes/EtOAc (1:1)

Sources & evidence

ORD record
ord-73e49a697f9e449a8dd1348f7706770e
Source dataset
uspto-grants-2004_04
Patent number
US06720336B2

Reaction notes

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