stereogenic centers of the obtained products were constructed with high diastereo- and enantioselectivity (up to >99% de and 92% ee). The reaction was successfully applied to the asymmetric synthesis of (−)-epibatidine, which was synthesized from the cyclohexanone derivative in seven steps in 30% overall yield.
用双官能
硫脲和
TMG连续处理γ,δ-不饱和β-
酮酸酯和硝基烯烃促进了串联迈克尔加成反应,从而以高收率产生了高度官能化的
环己酮。获得的产物的三个连续的立体异构中心的构建具有高非对映选择性和对映选择性(高达> 99%的de和92%的ee)。该反应成功地应用于(-)-表巴替丁的不对称合成,该过程由
环己酮衍
生物分7个步骤合成,总收率为30%。