Water → Tert-butyl 4-(3,5,6-trifluoropyridin-2-yl)piperazine-1-carboxylate

HRID 730747Notes

Reaction equation

F[C:2]1[C:7]([F:8])=[CH:6][C:5]([F:9])=[C:4]([F:10])[N:3]=1.[C:11]([N:18]1[CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1)([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12].C(N(CC)C(C)C)(C)C.O>CN1C(=O)CCC1>[C:14]([O:13][C:11]([N:18]1[CH2:23][CH2:22][N:21]([C:2]2[C:7]([F:8])=[CH:6][C:5]([F:9])=[C:4]([F:10])[N:3]=2)[CH2:20][CH2:19]1)=[O:12])([CH3:17])([CH3:15])[CH3:16]

Participants

Conditions

Temperature: 150 °C

Procedure

A mixture of 2,3,5,6-tetrafluoropyridine (755 mg, 5 mmol, Aldrich), 1-Boc-piperazine (558 mg, 3 mmol, Aldrich) and N,N-diisopropylethylamine (1 mL, 5.8 mmol, Aldrich) in NMP (5 mL) was heated at 150° C. for 16 h. The reaction mixture was cooled to room temperature, water (25 mL) was added, and the mixture was extracted with EtOAc (2×40 mL). The combined organic phases were washed with brine (50 mL), then dried over Na2SO4 and filtered. The filtrate was concentrated in vacuo and the residue was purified by silica gel column chromatography, eluting with 20% EtOAc/hexane to give the title compound as a white solid. MS (ESI, pos. ion) m/z: 318 (M+1).

Workup

temperatureThe reaction mixture was cooled to room temperature
extractionthe mixture was extracted with EtOAc (2×40 mL)
washThe combined organic phases were washed with brine (50 mL)
dry with materialdried over Na2SO4
filtrationfiltered
concentrationThe filtrate was concentrated in vacuo
customthe residue was purified by silica gel column chromatography
washeluting with 20% EtOAc/hexane

Sources & evidence

ORD record: ord-e1c5ce74141c4cd1ac37d5ade23b85ee
Source dataset: uspto-grants-2009_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07582761B2

Reaction notes

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