反应详情

温度

50 °C

To a solution of ester from step 2 in THF-MeOH (4:1, 0.5M) was added LiOH (3 eq, 2M) and the mixture was stirred at 50° C. for 1 h. The organic solvent was evaporated, the aqueous layer was acidified with HCl 1N and the acid extracted with EtOAc (3×). The combinedorganic extracts were washed with brine, dried and evaporated to afford 2-(4-bromophenyl)cyclopropanecarboxylic acid. Optically active intermediates were obtained by separation on chiral column (Chiral Pak AD) using hexane:EtOH (90:10 with 0.2% TFA).

1. customThe organic solvent was evaporated
2. extractionthe acid extracted with EtOAc (3×)
3. washThe combinedorganic extracts were washed with brine
4. customdried
5. customevaporated