Water → HCID 22993473, compound

HRID 1275245Notes

Reaction equation

C([O:5][C:6](=[O:22])[NH:7][CH:8]([C:14]1[CH:19]=[CH:18][C:17]([F:20])=[C:16]([F:21])[CH:15]=1)[CH:9]([CH:11]1[CH2:13][CH2:12]1)O)(C)(C)C.[H-].[Na+].O>C1COCC1>[CH:11]1([CH:9]2[O:22][C:6](=[O:5])[NH:7][CH:8]2[C:14]2[CH:19]=[CH:18][C:17]([F:20])=[C:16]([F:21])[CH:15]=2)[CH2:12][CH2:13]1

Participants

Conditions

Temperature: 35 °C

Procedure

To a well stirred solution of [2-cyclopropyl-1-(3,4-difluorophenyl)-2-hydroxy-ethyl]-carbamic acid-tert-butyl ester (1.7 g, 5.4 mmol) in THF (20 mL) was added 95% NaH (0.4 g, 16.2 mmol) at room temperature. The resulting suspension was stirred for 3 h at about 35° C. (warm water bath) and then quenched carefully with ice. The biphasic mixture was extracted with 100 mL of EtOAc, washed with brine, dried over Na2SO4, filtered and the solvent was removed in vacuo to yield 5-cyclopropyl-4-(3,4-difluorophenyl)-oxazolidin-2-one (1.3 g, 93% yield) as a 3:1 mixture of the trans:cis diastereomers. The diastereomers were separated by column chromatography over silica gel with 7:3 cyclohexane/ethyl acetate as the eluting system. The trans isomer eluted first (Rf=2.5, 0.65 g) followed by the cis isomer (Rf =2.0, 0.2 g). The relative streochemistry was assigned by comparing the 1H NMR of the two isomers of 5-cyclopropyl-4-(3,4-difluorophenyl)-oxazolidin-2-one to the corresponding isomers of 4-(3,4-difluorophenyl)-5-methyl-oxazolidin-2-one as described in Example 19.

Workup

customquenched carefully with ice
extractionThe biphasic mixture was extracted with 100 mL of EtOAc
washwashed with brine
dry with materialdried over Na2SO4
filtrationfiltered
customthe solvent was removed in vacuo

Sources & evidence

ORD record: ord-7c81832c30ab486fb699d8aa36599f29
Source dataset: uspto-grants-2000_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06159990

Reaction notes

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