condensation–reduction approach, which was carried out in water, has been reported. Using Hantzsch esters as reducing agent, under the promotion of base, a variety of reduced Knoevenagel adducts could be easily prepared by direct alkylation of malononitrile, ethyl 2-cyanoacetate, and 2-(4-nitrophenyl)acetonitrile, respectively. Meanwhile, a gram-scale synthesis of the protocol was also realized with excellent
已经报道了在
水中进行的级联 Knoevenagel 缩合还原方法。以Hantzsch
酯为还原剂,在碱的促进下,
丙二腈、2-
氰基
乙酸乙酯和2-(4-
硝基苯基)
乙腈分别直接烷基化反应,可以很容易地制备出多种还原的Knoevenagel加合物。同时,该协议的克级合成也以优异的分离产率实现。