3-methyl-1,4-dioxane-2,5-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Methoxy-2-oxoethyl lactate (123 mg, 0.76 mmol), prepared as described in Example 1, was added to 25 mL of refluxing toluene containing (1S)-(+)-10-camphor-sulfonic acid (8.8 mg, 0.038 mmol). The refluxing toluene was made to pass through ca. 8 mL of crushed molecular sieves (type 4A) before returning to the reaction vessel. After 6 hr, the reaction mixture was cooled to room temperature, applied to a 40 mL silica gel column equilibrated in toluene and eluted with ethyl acetate. The ethyl acetate was evaporated and the title compound was identified as a component of the recovered material by GC (Method A) and GC/MS: HRMS calcd for C5H6O4 130.0266, obsd 130.0265. eluted with ethyl acetate The ethyl acetate was evaporated