Hydrogen Bromide → HCID 46938321, compound

HRID 1963422Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@H:8]2[CH2:13][C@@H:12]([C:14]3[O:18][NH:17][C:16](=[O:19])[CH:15]=3)[CH2:11][CH2:10][N:9]2C(OC)=O)=[CH:4][C:3]=1[F:24].Br>>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@H:8]2[CH2:13][C@@H:12]([C:14]3[O:18][NH:17][C:16](=[O:19])[CH:15]=3)[CH2:11][CH2:10][NH:9]2)=[CH:4][C:3]=1[F:24]

Participants

Reactant 2

HCID 260Hydrogen Bromide

HCID 68502958HCID 68502958, compound

Product 1

HCID 46938321HCID 46938321, compoundYield 71.1%

Procedure

(2R,4S)-Methyl 2-(4-chloro-3-fluorophenyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate (446 mg, 1.26 mmol) was dissolved in hydrogen bromide (33% in AcOH, 6.8 mL, 38.97 mmol) and stirred at room temperature for 20 h. The solvent was then evaporated and the residue purified by preparative HPLC (Instrument: FractionLynx II, Mobilphase: gradient 5-95% MeCN in 0.2% NH3, pH 10, Column: Xbridge Prep C18 5 μm OBD 19*150 mm) to yield 5-((2R,4S)-2-(4-chloro-3-fluorophenyl)piperidin-4-yl)isoxazol-3(2H)-one (266 mg, 71%). 1H NMR (600 MHz, dmso) δ 1.31 (q, 1H), 1.44 (dq, 1H), 1.82-1.89 (m, 1H), 1.94-2.00 (m, 1H), 2.70 (dt, 1H), 2.84 (tt, 1H), 3.06-3.12 (m, 1H), 3.66 (dd, 1H), 5.72 (s, 1H), 7.23 (dd, 1H), 7.38 (dd, 1H), 7.49 (t, 1H). HRMS Calculated for [C14H14ClFN2O2+H]+: 297.0806. Found: 297.0795

Workup

customThe solvent was then evaporated
customthe residue purified by preparative HPLC (Instrument: FractionLynx II, Mobilphase: gradient 5-95% MeCN in 0.2% NH3, pH 10, Column: Xbridge Prep C18 5 μm OBD 19*150 mm)

Sources & evidence

ORD record: ord-35f9624f11be4f01a8b0740e75fd5865
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08415378B2

Reaction notes

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