Pyridine → 4-(4-Chloro-phenyl)-3-methoxycarbonylmethyl-piperazine-1-carboxylic acid tert-butyl ester

HRID 917231Notes

Reaction equation

HRID 917231 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5](B(O)O)=[CH:4][CH:3]=1.[C:11]([O:15][C:16]([N:18]1[CH2:23][CH2:22][NH:21][CH:20]([CH2:24][C:25]([O:27][CH3:28])=[O:26])[CH2:19]1)=[O:17])([CH3:14])([CH3:13])[CH3:12].N1C=CC=CC=1>ClCCl.C([O-])(=O)C.[Cu+2].C([O-])(=O)C>[C:11]([O:15][C:16]([N:18]1[CH2:23][CH2:22][N:21]([C:5]2[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=2)[CH:20]([CH2:24][C:25]([O:27][CH3:28])=[O:26])[CH2:19]1)=[O:17])([CH3:14])([CH3:13])[CH3:12]

Participants

6

Reactant 3

HCID 1049PyridineHCID 742994-Chlorophenylboronic acidHCID 2756816Methyl 4-Boc-piperazine-2-acetate

Product 1

HCID 667586684-(4-Chloro-phenyl)-3-methoxycarbonylmethyl-piperazine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 2

HCID 8895Cupric acetateCatalystHCID 6344DichloromethaneSolvent

Procedure

4-Chlorophenyl boronic acid (1.08 g, 6.97 mmol) and 3-methoxycarbonylmethyl-piperazine-1-carboxylic acid tert-butyl ester (0.9 g, 3.48 mmol) were dissolved in dichloromethane. To this mixture was added copper acetate (0.63 g, 3.48 mmol), 4 Å molecular sieves and pyridine (0.56 mL, 6.97 mmol) and the reaction mixture was stirred at room temperature for 72 h. The reaction mixture was concentrated in vacuo and dissolved in ethyl acetate, filtered through celite and concentrated. The crude product was purified using gradient elution from hexane/ethyl acetate (5%) to hexane/ethyl acetate (20%). ESI-MS m/z: 369 (M+1), UV retention time: 2.97 min.

Workup

  1. concentrationThe reaction mixture was concentrated in vacuo
  2. dissolutiondissolved in ethyl acetate
  3. filtrationfiltered through celite
  4. concentrationconcentrated
  5. customThe crude product was purified
  6. washelution from hexane/ethyl acetate (5%) to hexane/ethyl acetate (20%)

Sources & evidence

ORD record
ord-6f51c8178f824b8da9e162a1b4e36b57
Source dataset
uspto-grants-2007_09
Patent number
US07271176B2

Reaction notes

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