Bromochloromethane → (3S)-3-Benzyloxycarbonylamino-1-chloro-4-phenyl-2-butanone

HRID 1071878Notes

Reaction equation

[CH2:1]([O:8][C:9]([N:11]1[C@@H:15]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C:14](=[O:23])OC1C1C=CC(OC)=CC=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Br[CH2:33][Cl:34].O1CCCC1.S([O-])(O)(=O)=O.[K+]>CCCCCC>[CH2:1]([O:8][C:9]([NH:11][C@@H:15]([CH2:16][C:17]1[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=1)[C:14](=[O:23])[CH2:33][Cl:34])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: -78 °C

Procedure

(4S)-N-benzyloxycarbonyl-2-(p-methoxyphenyl)-4-phenylmethyloxazolidin-5-one (Tetrahedron Lett. 1995, 36, 42, 7761) (700 mg) and bromochloromethane (0.142 ml) were added to dehydrated tetrahydrofuran (16.8 ml), and they were cooled to −78° C. 1.54 Mn-butyllithium solution (1.42 ml) in hexane was added to the obtained mixture, and they were stirred for 33 minutes. 5% aqueous potassium hydrogensulfate solution was added to the reaction mixture to terminate the reaction. After the extraction with ethyl acetate at room temperature twice followed by drying over anhydrous magnesium sulfate, magnesium sulfate was removed. The obtained solution in ethyl acetate was analyzed by HPLC to find that (3S)-3-benzyloxycarbonylamino-1-chloro-4-phenyl-2-butanone (347 mg) was obtained in a yield of 62%.

Workup

customto terminate
customthe reaction
extractionAfter the extraction with ethyl acetate at room temperature
dry with materialby drying over anhydrous magnesium sulfate, magnesium sulfate
customwas removed
customwas obtained in a yield of 62%

Sources & evidence

ORD record: ord-d21d236bd5fd4462a1b15473af0a357d
Source dataset: uspto-grants-2005_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06906224B2

Reaction notes

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