3.5. Acetylation Reactions

Compounds 5 and 9 (25 mg each) were separately dissolved in pyridine (0.5 mL). Acetic anhydride (0.5 mL) was added dropwise to the stirring solutions. The reaction mixtures were left stirring overnight at room temperature (r.t.). The reaction crudes were then diluted into EtOAc (10 mL) and washed four times with a 10% HCl solution. The organic fractions were dried with anhydrous sodium sulfate and dried in vacuo to give the acetylated products. The purity of the products was assessed by TLC.