Methyl iodide → (3R,4R)-tert-butyl 3-hydroxy-4-(4-methoxyphenyl)piperidine-1-carboxylate

HRID 1507255Notes

Reaction equation

HRID 1507255 reaction equation
[OH:1][C@@H:2]1[C@@H:7]([C:8]2[CH:13]=[CH:12][C:11]([OH:14])=[CH:10][CH:9]=2)[CH2:6][CH2:5][N:4]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:3]1.[C:22]([O-])([O-])=O.[K+].[K+].CI>CN(C=O)C.C(OCC)(=O)C>[OH:1][C@@H:2]1[C@@H:7]([C:8]2[CH:9]=[CH:10][C:11]([O:14][CH3:22])=[CH:12][CH:13]=2)[CH2:6][CH2:5][N:4]([C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])[CH2:3]1

Participants

6

Reactant 3

HCID 6328Methyl iodideHCID 11430Potassium CarbonateHCID 11483231(3R,4R)-tert-Butyl 3-hydroxy-4-(4-hydroxyphenyl)piperidine-1-carboxylate

Product 1

HCID 57240152(3R,4R)-tert-butyl 3-hydroxy-4-(4-methoxyphenyl)piperidine-1-carboxylateYield 88%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of (3R,4R)-tert-butyl 3-hydroxy-4-(4-hydroxyphenyl)piperidine-1-carboxylate (490 mg, 1.67 mmol, procedure from WO 2000/63173) in DMF (6 mL) was added K2CO3 (577 mg, 4.2 mmol) followed by methyl iodide (0.52 mL, 8.4 mmol) at rt. The mixture was stirred at rt for 18 h. It was then diluted with 50 mL ethyl acetate and the solids were removed by filtration. The solvent was then evaporated under vacuum and the residue was purified via silica gel chromatography (hexanes-100% EtOAc) to yield (3R,4R)-tert-butyl 3-hydroxy-4-(4-methoxyphenyl)piperidine-1-carboxylate (450 mg, 88% yield). LCMS (method T) RT 3.068 min, m/z 306.3 (M−H)−; 1H NMR (500 MHz, chloroform-d) δ 7.15 (d, J=8.7 Hz, 2H), 6.87 (d, J=8.7 Hz, 2H), 4.40-4.30 (m, 1H), 4.25-4.05 (m, 1H), 3.78 (s, 3H), 3.64-3.52 (m, 1H), 2.77-2.66 (m, 1H), 2.65-2.51 (m, 1H), 2.45 (br. s., 1H), 2.26-2.10 (m, 1H), 1.76 (d, J=2.7 Hz, 1H), 1.71-1.60 (m, 1H), 1.48 (s, 9H).

Workup

  1. customthe solids were removed by filtration
  2. customThe solvent was then evaporated under vacuum
  3. customthe residue was purified via silica gel chromatography (hexanes-100% EtOAc)

Sources & evidence

ORD record
ord-854c700967584492bfc7af50d76ddab4
Source dataset
uspto-grants-2015_12
Patent number
US09221796B2

Reaction notes

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