Imidazole → (2Z)-4-{[tert-butyl(dimethyl)silyl]oxy}-2-[4-(methylsulfonyl)phenyl]-3-phenylbut-2-en-1-ol

HRID 1375703

Reaction equation

[CH3:1][S:2]([C:5]1[CH:10]=[CH:9][C:8](/[C:11](=[C:14](\[C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)/[CH2:15][OH:16])/[CH2:12][OH:13])=[CH:7][CH:6]=1)(=[O:4])=[O:3].N1C=CN=C1.[CH3:28][C:29]([Si:32](Cl)([CH3:34])[CH3:33])([CH3:31])[CH3:30]>C1COCC1.ClCCl.[Cl-].[Na+].O>[Si:32]([O:16][CH2:15]/[C:14](/[C:17]1[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=1)=[C:11](/[C:8]1[CH:7]=[CH:6][C:5]([S:2]([CH3:1])(=[O:3])=[O:4])=[CH:10][CH:9]=1)\[CH2:12][OH:13])([C:29]([CH3:31])([CH3:30])[CH3:28])([CH3:34])[CH3:33]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 110 g of (2Z)-2-[4-(methylsulfonyl)phenyl]-3-phenylbut-2-ene-1,4-diol and of imidazole in 1 L of THF stirred at −78° C., a solution 51 g of TBSCl in 250 mL of dichloromethane was added dropwise. The resulting mixture was stirred at −78° C. 0.5 hr. Brine was then added and then warmed to room temperature. The organic phase was separated and the aqueous phase was extracted with EtOAc. The organic phases were combined and dried over Na2SO4 and evaporated. The resulting crude material was purified by flash chromatography to afford 25.6 g of the title compound as a white solid. 1H NMR (acetone-d6, 500 M Hz): δ 7.69 (d, 2H), 7.37 (d, 2H), 7.18–7.04 (m, 5H), 4.77 (s, 2H), 4.65 (d, 2H), 3.96 (t, 1H, OH), 3.03 (s, 3H), 0.84 (s, 9H), 0.01 (s, 6H).

Workup

custom0.5 hr
temperaturewarmed to room temperature
customThe organic phase was separated
extractionthe aqueous phase was extracted with EtOAc
dry with materialdried over Na2SO4
customevaporated
customThe resulting crude material was purified by flash chromatography

Sources & evidence

ORD record: ord-b541e7ac25584af28eed67fe53b63920
Source dataset: uspto-grants-2007_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07169809B2

Linked notes

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