4-Toluenesulfonyl chloride → (R)-2-Tosyloxypropionic acid methyl ester

Participants

Reaction Steps

A solution of methyl(R)-(+)-lactate (6.66 g) in acetonitrile (33 ml) was cooled to 5° C. and triethylamine (9.8 ml) added followed by trimethylamine hydrochloride (0.62 g). A separate solution of p-toluenesulfonyl chloride (11.6 g) in acetonitrile (33 ml) was added dropwise over 20 min maintaining the temperature below 5° C. The reaction mixture was filtered and concentrated, Diethylether and water were added and the organic fraction dried (MgSO4) and concentrated in vacuo to give the sub-title compound as a yellow oil (13.71 g).

Provenance & Evidence