Methanol → N-Benzyl-N-[2-benzyloxy-5-(2-bromo-1-(R)-hydroxyethyl)phenyl]methane-sulfonamide

HRID 1696856Notes

Reaction equation

B.C1COCC1.[CH2:7]([N:14]([C:19]1[CH:24]=[C:23]([C:25](=[O:28])[CH2:26][Br:27])[CH:22]=[CH:21][C:20]=1[O:29][CH2:30][C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)[S:15]([CH3:18])(=[O:17])=[O:16])[C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1.CO>C1(C)C=CC=CC=1.C1COCC1>[CH2:7]([N:14]([C:19]1[CH:24]=[C:23]([C@@H:25]([OH:28])[CH2:26][Br:27])[CH:22]=[CH:21][C:20]=1[O:29][CH2:30][C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)[S:15]([CH3:18])(=[O:17])=[O:16])[C:8]1[CH:9]=[CH:10][CH:11]=[CH:12][CH:13]=1

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of BH3.THF in THF (1 M, 30.70 mmol) was added to a mixture of N-benzyl-N-[2-benzyloxy-5-(2-bromoacetyl)phenyl]methanesulfonamide (131) (25.00 g, 51.20 mmol) and R-methyl-CBS-oxazoborolidine (1 M in toluene, 5.10 mL, 5.10 mmol) in anhydrous THF (150 mL). The reaction mixture was stirred at 0° C. for 15 min and then at rt for 16 h. Methanol (100 mL) was then slowly added to quench the reaction. After removal of solvent by rotary evaporation, the resulting residue was purified by column chromatography (silica gel, dichloromethane only) to give desired bromo alcohol 132 as an orange oil (23.80 g, 95% yield): 1H NMR (500 MHz, CDCl3) δ 2.86 (s, 3H), 3.30-3.38 (m, 2H), 4.70 (m, 3H), 5.11 (s, 2H), 7.00 (m, 2H), 7.21 (m, 5H), 7.28 (d, 1H), 7.42 (m, 5H).

Workup

waitat rt for 16 h
customto quench
customthe reaction
customAfter removal of solvent
customby rotary evaporation
customthe resulting residue was purified by column chromatography (silica gel, dichloromethane only)

Sources & evidence

ORD record: ord-614bb9b63ebf4d598a89ecd4af948dec
Source dataset: uspto-grants-2012_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08163758B2

Reaction notes

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