4-Toluenesulfonyl chloride → Ethyl 3-[3,4-difluoro-5-((1S)-1-hydroxy-2-{[(4-methylphenyl)sulfonyl]oxy}ethyl)phenyl]propanoate

HRID 602046Notes

Reaction equation

[C:1]1([CH3:11])[CH:6]=[CH:5][C:4]([S:7](Cl)(=[O:9])=[O:8])=[CH:3][CH:2]=1.[OH:12][C@@H:13]([C:16]1[CH:17]=[C:18]([CH:24](CC)[CH2:25][C:26]([O:28][CH2:29][CH3:30])=[O:27])[CH:19]=[C:20]([F:23])[C:21]=1[F:22])[CH2:14][OH:15]>N1C=CC=CC=1>[F:23][C:20]1[CH:19]=[C:18]([CH2:24][CH2:25][C:26]([O:28][CH2:29][CH3:30])=[O:27])[CH:17]=[C:16]([C@H:13]([OH:12])[CH2:14][O:15][S:7]([C:4]2[CH:5]=[CH:6][C:1]([CH3:11])=[CH:2][CH:3]=2)(=[O:9])=[O:8])[C:21]=1[F:22]

Participants

Conditions

Temperature: -15 °C

Procedure

p-Toluenesulfonyl chloride (9.03 g, 0.0474 mol) in pyridine (25 mL) was added dropwise to a cooled (−15° C.) solution of ethyl 3-{3-[(1S)-1,2-dihydroxyethyl]-4,5-difluorophenyl}pentanoate (13.02 g, 0.043 mol) in pyridine (50 mL) under N2. The reaction was stirred at −15° C. and warmed to RT overnight. The reaction mixture was quenched with H2O and extracted three times with ethyl ether. The combined ether layers were washed with 1N HCl, sat. CuSO4, and brine. The organic layer was dried over Na2SO4, filtered, and concentrated. Column chromatography (hexane:ethylacetate, 0-30%) yielded the desired product (14.68 g, 75%).

Workup

temperaturewarmed to RT overnight
customThe reaction mixture was quenched with H2O
extractionextracted three times with ethyl ether
washThe combined ether layers were washed with 1N HCl, sat. CuSO4, and brine
dry with materialThe organic layer was dried over Na2SO4
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-3e21e6894a56454bad9c6c94f4cf3fa2
Source dataset: uspto-grants-2011_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07902394B2

Reaction notes

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