Triphenylphosphine → Methyl (R)-4-Chloro-3-hydroxybutyrate

Participants

Reaction Conditions

Reaction Steps

To a solution of (R)-methyl 3,4-dihydroxybutanoate (125.1 g, 0.93 mol) in CH2Cl2 (1.8 L) was added PPh3 (244.5 g, 0.93 mol) and slowly added NCS (124.2 g, 0.93 mol) under ice water cooling. The mixture was stirred at 5° C. for 20 min and then stirred for 18 h at room temperature. After evaporating the solvent, the residue was purified by column chromatography (P.E\E.A 20:1-5:1, gradient) to give (R)methyl 4-chloro-3-hydroxybutanoate (33 g, 26% over 3 steps). 1H NMR (300 MHz, CDCl3)δ 4.18-4.25 (m, 1H), 3.68 (s, 3H), 3.55-3.60 (m, 2H), 3.32-3.33 (d, J=42 Hz, 1H), 2.52-2.68 (m, 2H).

Provenance & Evidence