反应详情

温度

-40 °C

A mixture of 11.4 g of tert-butyl 4-chlorophenylcarbamate in 100 ml of ether is cooled to −40° C., under an atmosphere of dry nitrogen, 80 ml of a 1.5M solution of tert-butyllithium in pentane are added dropwise and the mixture is stirred at −20° C. for 3 hours. The reaction mixture is cooled to −40° C., a solution of 14 g of the compound obtained in step A in 50 ml of THF is added over 1 hour, and the mixture is stirred at RT for 4 days. The reaction mixture is poured into saturated NH4Cl solution and the precipitate formed is filtered off by suction and dried. 10.2 g of the expected product are obtained, and are used without further purification in the following step.

1. temperatureThe reaction mixture is cooled to −40° C.
2. stirringthe mixture is stirred at RT for 4 days
3. customthe precipitate formed
4. filtrationis filtered off by suction
5. customdried