moiety spanning an all-carbon quaternary stereogenic spirocenter was achieved using a masked bromomethyl vinyl ketone reagent. The developed protocol entails an enantioselective palladium-catalyzed allylic alkylation reaction followed by a one-pot unmasking/RCM sequence that provides access to the spirocyclic compounds in good yields and selectivities.
使用掩蔽的
溴甲基乙烯基酮试剂,可以快速进入具有1,4-二羰基部分的对映体富集的螺环,该螺环跨全碳四元立体立体螺中心。制定的协议需要对映选择性
钯催化的烯丙基烷基化反应,然后进行一锅解掩蔽/ RCM序列,该序列可提供高收率和选择性的
螺环化合物。