Ethyl Acetate → 2-Methanesulfonyloxy-5-methylbenzoic acid methyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a ice cooled suspension of sodium hydride (60%, 1.3 g, 78.3 mmol) in THF (100 mL) is added a solution of 2-hydroxy-5-methylbenzoic acid methyl ester (10 g, 60 mmol) in THF (20 mL) and it is stirred at 0° C. Then a solution of methanesulfonyl chloride (8.2 g, 72 mmol) in THF (20 mL) is added dropwise. The reaction mixture is stirred at RT for 18 h. Then the reaction mixture is cooled in an ice bath and slowly ice is added to quench the reaction. EtOAc is used to extract. Brine is added to the aqueous phase and re-extracted with EtOAc. The combined organic phase is washed with water, brine, dried over NaSO4 and MgSO4, and concentrated to give the title compound as an oil. It is used directly in the next step.

Herkunft & Nachweise