Diisopropylamine → HCID 86633705, compound

Participants

Reaction Steps

To a solution of diisopropylamine (47.1 g, 466.1 mmol) in THF (500 mL) cooled to −50.degree. C. is added n-butyllithium (466.1 mmol, 2.5M in hexanes) and the resulting solution is stirred at −50.degree. C. for 0.5 h. The reaction mixture is cooled to −78.degree. C. followed by slow addition of methyl (3R)-3-hydroxybutanoate (25 g, 211.9 mmol). After 0.5 h a solution of cinnamyl bromide (45.9 g, 233.0 mmol) in HMPA (10 mL) is added and the reaction mixture is allowed to warm to 0.degree. C. and stirred for 16 h. The reaction mixture is quenched by addition 30 mL of saturated aqueous ammonium chloride solution, is poured into 400 mL of 1 M hydrochloric acid, and is extracted with two 500 mL portions of ethyl acetate. The combined organic layers are dried over magnesium sulfate, concentrated in vacuo, and purified by silica gel chromatography (elution with 25% ethyl acetate-hexanes) to afford methyl (2R,3R)-2-[(2E)-3-phenyl-2-propen-1-yl]-3-hydroxybutanoate as a yellow oil (42 g, 85% yield).

Provenance & Evidence