2-Methyl-9-fluorenecarboxylic acid → 2-Methyl-9-fluorenemethanol

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반응 단계

A solution of 2-methyl-9-fluorenecarboxylic acid (6 g, 26.8 mmol) in 300 mL of THF at 0° C. was charged with IM THF solution of BH3-THF complex (53.5 mL, 53.5 mmol). The reaction mixture was stirred overnight then quenched with 30 mL of 10% acetic acid in methanol and diluted with 300 mL of water. The layers were separated, the aqueous phase was extracted with ethyl acetate (3×50 mL), the combined extracts were dried over magnesium sulfate and evaporated to give colorless oil. Crystallization was accomplished upon treatment of the oil with 200 mL of hexane. Recrystallization from ethanol:water 4:1 afforded 4.55 g (80.6%) of 2-methyl-9-fluorenemethanol.

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