A facile and convenient way to functionalized trifluoromethylated spirocyclic[indole-3,4-pyrano[2,3-c]pyrazole] derivatives
作者:Xiaoqing Liu、Xiaoling Xu、Xu Wang、Wenxin Yang、Qun Qian、Min Zhang、Liping Song、Hongmei Deng、Min Shao
DOI:10.1016/j.tetlet.2013.06.038
日期:2013.8
An efficient and consecutive one-pot, two-step, four-component reaction for the synthesis of trifluoromethylated spirocyclic[indole-3,4-pyrano[2,3-c]pyrazole] derivatives by the reaction of isatin, malononitrile, ethyl cyanoacetate, or cyanoacetamide, ethyl 4,4,4-trifluoroacetoacetate and hydrazine in the presence of a catalytic amount of piperidine in good yields was described. The structures of new
高效,连续的一锅,两步,四组分反应,通过靛红,丙二腈,氰基乙酸乙酯的反应合成三氟甲基化螺环[吲哚-3,4-吡喃并[2,3- c ]吡唑]衍生物描述了在催化量的哌啶存在下,氰基乙酰胺,氰基乙酰胺,4,4,4-三氟乙酰乙酸乙酯和肼的收率很高。通过光谱方法,显微分析和X射线衍射分析确定了新化合物的结构。另外,本文提出了反应的可能机理。