Base-Promoted Cascade Approach for the Preparation of Reduced Knoevenagel Adducts Using Hantzsch Esters as Reducing Agent in Water
作者:Zhouyu Wang、Tao He、Ronghua Shi、Yimou Gong、Guangyou Jiang、Ming Liu、Shan Qian
DOI:10.1055/s-0035-1562099
日期:——
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。