反应详情

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.

1. customthen quenched with 30 mL of 10% acetic acid in methanol
2. additiondiluted with 300 mL of water
3. customThe layers were separated
4. extractionthe aqueous phase was extracted with ethyl acetate (3×50 mL)
5. dry with materialthe combined extracts were dried over magnesium sulfate
6. customevaporated
7. customto give colorless oil
8. customCrystallization
9. customRecrystallization from ethanol:water 4:1