2,2-dimethyl-5-octanoyl-1,3-dioxane-4,6-dione

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

Procedure: The resulting 5-octanoyl-2,2-dimethyl-1,3-dioxane-4,6-dione was allowed to reflux in ethanol for 2 hours, and then concentrated under reduced pressure. The resulting residue was purified using silica gel chromatography (developing solvent: n-hexane/ethyl acetate=8/2) to obtain ethyl 3-oxodecanoate shown by the formula below. concentrated under reduced pressure The resulting residue was purified

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

Procedure: N,N′-Dicyclohexylcarbodiimide (11 mmol) was added to a stirred solution of octanoic acid (10 mmol) and 4-dimethylaminopyridine (12 mmol) in dry dichloromethane (40 ml). The mixture was stirred at room temperature for 1 hour and Meldrum's acid (10 mmol) was added. The stirring was continued at room temperature overnight. The solvent was removed in vacuum and the residue redissolved in ethyl acetate and filtered. The filtrate was washed with 2 M HCl solution and dried over MgSO4. The solvent was rotary evaporated to obtain the title product as an oil in 95% yield and was used without purification in the next step. The stirring was continued at room temperature overnight The solvent was removed in vacuum the residue redissolved in ethyl acetate filtered The filtrate was washed with 2 M HCl solution dried over MgSO4 The solvent was rotary evaporated