Oxiranemethanol, 4-methylbenzenesulfonate, (S)- → Toluene-4-sulfonic acid (s)-2-hydroxy-4-phenylbutyl ester

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Add phenyl methyl magnesium bromide (14 mL, 14 mmol, 1 M in tetrahydrofuran) to a solution of lithium tetrachlorocuprate (5.5 mL, 0.55 mmol, 0.1 M in tetrahydrofuran) in dry tetrahydrofuran (10 mL) and stir at −35° C. (acetonitrile/dry ice bath) for 15 minutes (J. Med. Chem., 41, 2451-2460, (1998); JOC, 54, 1295-1304, (1989)). Cool to −35° C. a solution of (2S)-(+)-glycidyl tosylate (2.51 g, 11.0 mmol) in dry tetrahydrofuran (4 mL) and transfer rapidly via cannula to the Grignard solution. Stir for 1 hour at −35° C., quench with a saturated aqueous ammonium chloride solution and dilute with diethyl ether. Wash the organic layer with saturated aqueous sodium chloride, dry (sodium sulfate), concentrate and purify (silica gel chromatography, eluting with 35:65 ethyl acetate:hexanes) to give the desired compound as a colorless oil (1.77 g, 50%)

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