Sodium Iodide → 4-[2-(3,4-Dimethoxy-phenyl)-ethyl]-piperazine-1-carboxylic acid t-butyl ester

HRID 655598

Reaction equation

Cl[CH2:2][CH2:3][C:4]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[C:6]([O:12][CH3:13])[CH:5]=1.[C:14]([O:18][C:19]([N:21]1[CH2:26][CH2:25][NH:24][CH2:23][CH2:22]1)=[O:20])([CH3:17])([CH3:16])[CH3:15].C([O-])([O-])=O.[K+].[K+].[Na+].[I-]>CN(C=O)C>[C:14]([O:18][C:19]([N:21]1[CH2:26][CH2:25][N:24]([CH2:2][CH2:3][C:4]2[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[C:6]([O:12][CH3:13])[CH:5]=2)[CH2:23][CH2:22]1)=[O:20])([CH3:17])([CH3:15])[CH3:16]

Participants

Conditions

Temperature: 80 °C

Procedure

A reaction mixture of 4-(2-chloroethyl)-1,2-dimethoxybenzene (3.6 g, 17.9 mmol), piperazine-1-carboxylic acid t-butyl ester (4.0 g, 21.5 mmol), K2CO3 (4.97 g, 36 mmol), and NaI (2.7 g, 18 mmol) in DMF (20 mL) was stirred at 80° C. for 3 h, cooled to room temperature, and partitioned between water and ethyl acetate. The organic layer was washed with water and brine, dried over anhydrous sodium sulfate, and concentrated. The residue was purified by column chromatography to afford 4-[2-(3,4-dimethoxy-phenyl)-ethyl]-piperazine-1-carboxylic acid t-butyl ester (4.8 g, 76%) which was dissolved in 4 N HCl in dioxane. This solution was stirred at room temperature for 4 h, concentrated, and dried in a high vacuum oven to give the title compound quantitatively.

Workup

temperaturecooled to room temperature
custompartitioned between water and ethyl acetate
washThe organic layer was washed with water and brine
dry with materialdried over anhydrous sodium sulfate
concentrationconcentrated
customThe residue was purified by column chromatography

Sources & evidence

ORD record: ord-5f9829d032d24b5a9f7bd5cfe5515bc6
Source dataset: uspto-grants-2011_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08071602B2

Linked notes

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