Trifluoroacetic acid → N-[(2,2,5,5-Tetramethyl-1,3-dioxan-4-yl)carbonyl]-beta-alanine methyl ester

Participants

Reaction Steps

A 5.0 g portion of calcium pantothenate was slurred in 100 ml of acetone:2,2-dimethoxypropane (1:1). Trifluoroacetic acid (3.0 ml) was added until solution was complete and stirring was continued overnight. A 10 g portion of potassium carbonate was added, this mixture stirred vigorously for 10 minutes and then concentrated to a gummy solid. A 100 ml portion of acetonitrile and 10 ml of methyl iodide were added to the solid. This mixture was stirred for 1 day, then poured into water and extracted twice with ethyl acetate. The extracts were combined, dried and concentrated, giving 4.8 g of the desired compound as a yellow oil.

Provenance & Evidence