2,2-Dimethoxypropane → (2S)-2-[(4R)-2,2-dimethyl-5-oxo-1,3-dioxolan-4-yl]propanoic acid

Participants

Reaction Steps

To a solution of (2R,3S)-2-hydroxy-3-methylsuccinic acid (2.48 g; 16.8 mmol; 1.0 eq.) in acetone (80.0 mL) was added 2,2-dimethoxypropane (4.13 g; 33.6 mmol; 2.0 eq.) and copper(II) chloride (226 mg; 1.68 mmol; 0.1 eq.). The resulting reaction mixture was stirred for 16 h at RT. The reaction mixture was evaporated and the residue taken up in CHCl3. Activated charcoal is added and the resulting mixture stirred for one hour. Filtration on a pad of celite gave the title product (mixture of diatereoisomers) as a greenish oil (1.85 g, 59%) used in the next step without further purification.

Provenance & Evidence