反应详情

206.8 ml (330.9 mmol) of a 1.6 molar n-butyllithium solution in n-hexane are slowly added to 97.3 g (240.7 mmol) of methyltriphenylphosphonium iodide in 800 ml of absolute THF under argon. The mixture is stirred at room temperature for 3 h. Then 20.0 g (120.3 mmol) of methyl 2-hydroxy-3-methylbenzoate in 200 ml of absolute THF are added dropwise to the reaction mixture. The mixture is stirred at 60° C. for 3 h. After cooling to room temperature, the precipitated lithium iodide is filtered off. The filtrate is concentrated in vacuo, and the residue is recrystallized from methanol. 27 g (56% of theory) of the title compound are obtained.

1. stirringThe mixture is stirred at 60° C. for 3 h
2. temperatureAfter cooling to room temperature
3. filtrationthe precipitated lithium iodide is filtered off
4. concentrationThe filtrate is concentrated in vacuo
5. customthe residue is recrystallized from methanol