Hydrogen Bromide → 5-(trans-2-(2,4-Difluorobenzyl)piperidin-4-yl)isoxazol-3(2h)-one

HRID 1963631Notes

Reaction equation

HRID 1963631 reaction equation
[F:1][C:2]1[CH:24]=[C:23]([F:25])[CH:22]=[CH:21][C:3]=1[CH2:4][C@H:5]1[CH2:10][C@H:9]([C:11]2[O:15][NH:14][C:13](=[O:16])[CH:12]=2)[CH2:8][CH2:7][N:6]1C(OC)=O.Br>>[F:1][C:2]1[CH:24]=[C:23]([F:25])[CH:22]=[CH:21][C:3]=1[CH2:4][C@H:5]1[CH2:10][C@H:9]([C:11]2[O:15][NH:14][C:13](=[O:16])[CH:12]=2)[CH2:8][CH2:7][NH:6]1

Participants

3

Reactant 2

HCID 260Hydrogen BromideHCID 131730492trans-Methyl 2-(2,4-difluorobenzyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate

Product 1

HCID 667319435-(trans-2-(2,4-Difluorobenzyl)piperidin-4-yl)isoxazol-3(2h)-oneYield 45.3%

Procedure

Trans-methyl 2-(2,4-difluorobenzyl)-4-(3-oxo-2,3-dihydroisoxazol-5-yl)piperidine-1-carboxylate (0.25 g, 0.71 mmol) was dissolved in hydrogen bromide (33% in acetic acid, 6.21 mL, 35.48 mmol) and stirred at room temperature for 16 h. The solvents were 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-(trans-2-(2,4-difluorobenzyl)piperidin-4-yl)isoxazol-3(2H)-one (94.6 mg, 45%). 1H NMR (600 MHz, dmso) δ 1.43-1.51 (m, 1H), 1.63-1.78 (m, 3H), 2.52-2.60 (m, 1H), 2.65 (d, 2H), 2.76-2.87 (m, 2H), 3.08-3.13 (m, 1H), 5.67 (s, 1H), 6.98 (td, 1H), 7.12 (td, 1H), 7.27-7.34 (m, 1H). HRMS Calculated for [C15H16F2N2O2+H]+: 295.1258. Found: 295.1265

Workup

  1. customThe solvents were evaporated
  2. 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-98930bf3601045bab7e715aa6ae52983
Source dataset
uspto-grants-2013_04
Patent number
US08415378B2

Reaction notes

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