tert-Butanol → (S)-1-(4-benzyloxyphenyl)-2-bromoethanol

HRID 2259339Notes

Reaction equation

[BH4-].[Li+].C(O)(C)(C)C.O1CCCC1.[CH2:13]([O:20][C:21]1[CH:30]=[CH:29][C:24]([C:25](=[O:28])[CH2:26][Br:27])=[CH:23][CH:22]=1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>C(OCC)C.O>[CH2:13]([O:20][C:21]1[CH:30]=[CH:29][C:24]([C@H:25]([OH:28])[CH2:26][Br:27])=[CH:23][CH:22]=1)[C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1

Participants

Conditions

Temperature: -60 °C

Procedure

A mixture of 10.8 g of (L)-dibenzoylcystine, 1.6 g of lithium borohydride, 2.4 g of tert-butanol and 180 ml of tetrahydrofuran was refluxed for 1 hour and then cooled to -60° C. Thereto was added 6.1 g of 4-benzyloxyphenacyl bromide. The mixture was stirred for 30 minutes at the same temperature and further for 3 hours at -40° to -30° C. The reaction mixture was added to a mixture of 100 ml of water and 200 ml of diethyl ether. The organic layer was separated, washed with water, a saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous sodium chloride solution in this order, and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure. The residue thus obtained was purified by column chromatography (eluant: toluene) to obtain 2.8 g of (S)-1-(4-benzyloxyphenyl)-2-bromoethanol.

Workup

temperaturewas refluxed for 1 hour
customThe organic layer was separated
washwashed with water
dry with materiala saturated aqueous sodium hydrogencarbonate solution and a saturated aqueous sodium chloride solution in this order, and dried over anhydrous magnesium sulfate
customThe solvent was removed by distillation under reduced pressure
customThe residue thus obtained
customwas purified by column chromatography (eluant: toluene)

Sources & evidence

ORD record: ord-437718f9c9344685a11c89b4db359c7c
Source dataset: uspto-grants-1995_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05472984

Reaction notes

Loading…