Methyl iodide → 4-[2-Methoxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester

HRID 550843Notes

Reaction equation

[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH:14]([C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([C:23]([F:26])([F:25])[F:24])[CH:18]=2)[CH2:15][OH:16])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[H-].[Na+].I[CH3:30]>O1CCCC1.CN(C)C=O>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([CH:14]([C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([C:23]([F:25])([F:26])[F:24])[CH:18]=2)[CH2:15][O:16][CH3:30])[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

Conditions

Temperature: 0 °C

Procedure

A mixture of 4-[2-Hydroxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester (200 mg, 0.53 mmol) in tetrahydrofuran (5 mL) and N,N-dimethylformamide (5 mL) at 0° C. was added sodium hydride (60% in mineral oil, 70 mg, 1.75 mmol) followed by iodomethane (230 mg, 1.62 mmole). The mixture was stirred at 0° C. for three hours. The reaction was quenched with saturated aqueous ammonium chloride solution and partitioned between ethyl acetate and water. The organic layer was dried with magnesium sulfate. Filtration, concentration gave a crude oil which was loaded onto a column of silica gel. Elution with 50% ethyl acetate/hexanes gave 4-[2-Methoxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester (190 mg, 92% yield) as a colorless oil. The NMR spectrum obtained on the sample is compatible with its structure.

Workup

customThe reaction was quenched with saturated aqueous ammonium chloride solution
custompartitioned between ethyl acetate and water
dry with materialThe organic layer was dried with magnesium sulfate
filtrationFiltration, concentration
customgave a crude oil which
washElution with 50% ethyl acetate/hexanes

Sources & evidence

ORD record: ord-291393b264c04030b02fbe21f89be22a
Source dataset: uspto-grants-2011_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07947692B2

Reaction notes

Loading…