Triethylamine → (4R,5S)-3-((R)-6-Cyclohexyl-4-methyl-hexanoyl)-4-methyl-5-phenyl-oxazolidin-2-one

HRID 349812Notes

Reaction equation

[CH:1]1([CH2:7][CH2:8][C@@H:9]([CH3:15])[CH2:10][CH2:11][C:12]([OH:14])=O)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.C(N(CC)CC)C.C(Cl)(=O)C(C)(C)C.[CH3:30][C@@H:31]1[C@H:35]([C:36]2[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=2)[O:34][C:33](=[O:42])[NH:32]1.[Cl-].[Li+]>C1COCC1>[CH:1]1([CH2:7][CH2:8][C@@H:9]([CH3:15])[CH2:10][CH2:11][C:12]([N:32]2[C@H:31]([CH3:30])[C@H:35]([C:36]3[CH:41]=[CH:40][CH:39]=[CH:38][CH:37]=3)[O:34][C:33]2=[O:42])=[O:14])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6]1

Participants

Conditions

Temperature: 0 °C

Procedure

A flask was charged with 4.17 g (19.6 mmol) of (R)-6-cyclohexyl-4-methyl-hexanoic acid, 40 mL of THF, and 8.56 mL (61.4 mmol) of triethylamine. The mixture was cooled in a 0° C. bath, and 2.41 mL (19.6 mmol) of pivaloyl chloride was added. The mixture was stirred for 1 h at 0° C. Then 2.79 g (16.4 mmol) of (4R,5S)-4-methyl-5-phenyl-2-oxazolidinone and 0.823 g (19.6 mmol) of lithium chloride were added as solids. The mixture was allowed to warm to room temperature and stirred overnight. The resulting solids were filtered off. The solvent was stripped under reduce pressure, and the residue was purified by column chromatography (eluent: 4:1 hexanes/ethyl acetate) to give 6.09 g (quant.) of a clear oil: 1H NMR (400 MHz, CDCl3) δ ppm 0.89 (m, 8 H) 1.16 (m, 6 H) 1.68 (m, 9 H) 2.87 (m, 1 H) 2.99 (m, 1 H) 4.76 (qd, J=6.83, 6.59 Hz, 1 H) 5.66 (d, J=7.32 Hz, 1 H) 7.30 (m, 2 H) 7.40 (m, 3 H). MS (APCl) m+1/z=372.

Workup

temperatureto warm to room temperature
stirringstirred overnight
filtrationThe resulting solids were filtered off
customthe residue was purified by column chromatography (eluent: 4:1 hexanes/ethyl acetate)
customto give 6.09 g (quant.) of a clear oil

Sources & evidence

ORD record: ord-f6ceb778e10a43279c56144377f13b91
Source dataset: uspto-grants-2007_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07179934B2

Reaction notes

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