反应详情

温度

-78 °C

Into a solution of 1-cyclopentyl-5-fluoro-6-methyl-1H-indole-3-carbonitrile (4.4 g, 18.2 mmol) and triisopropyl borate (7.6 mL, 33 mmol) in THF (75 mL) at −78° C. was added LDA (1.5 M in cyclohexane, 15.8 mL, 23.7 mmol). The mixture was stirred at −78° C. for 30 min, quenched with ice water (200 mL) and stirred for 15 min without cooling. The mixture was extracted with ethyl acetate 1:1 in hexane (20 mL). The aqueous layer was acidified with aq. 2 N HCl to pH 5 and then extracted with CH2Cl2 (100 mL). The organic layer was dried over Na2SO4 and concentrated to give 3-cyano-1-cyclobutyl-6-cyclopropyl-1H-indol-2-ylboronic acid as a solid (6.2 g, 90% pure by LCMS) which was used in the next step without further purification.

1. customquenched with ice water (200 mL)
2. stirringstirred for 15 min
3. temperaturewithout cooling
4. extractionThe mixture was extracted with ethyl acetate 1:1 in hexane (20 mL)
5. extractionextracted with CH2Cl2 (100 mL)
6. dry with materialThe organic layer was dried over Na2SO4
7. concentrationconcentrated