Magnetically retrievable nano crystalline CuFe2O4 catalyzed multi-component reaction: a facile and efficient synthesis of functionalized dihydropyrano[2,3-c]pyrazole, pyrano[3,2-c]coumarin and 4H-chromene derivatives in aqueous media
作者:Koyel Pradhan、Sanjay Paul、Asish R. Das
DOI:10.1039/c3cy00901g
日期:——
4H-chromene derivatives at mild conditions and in excellent yields. The four component reaction (4CRs) of a wide variety of substituted hydrazine derivatives, ethyl acetoacetate, dialkyl acetylenedicarboxylates and alkyl nitrile derivatives (malononitrile and ethyl cyanoacetate) gave the targeted dihydropyrano[2,3-c]pyrazoles. When two equivalents of dialkyl acetylenedicarboxylates were introduced replacing
合成了CuFe 2 O 4磁性纳米颗粒,并被认为是在温和条件下单锅合成二氢吡喃并[ 2,3- c ]吡唑,吡喃并[3,2- c ]香豆素和4 H-色烯衍生物的有效催化剂。高产。多种取代的肼衍生物,乙酰乙酸乙酯,乙酰二羧酸二烷基酯和烷基腈衍生物(丙二腈和氰基乙酸乙酯)的四组分反应(4CR)得到目标二氢吡喃并[2,3- c ]吡唑。当引入两当量的乙酰二羧酸二烷基酯代替乙酰乙酸乙酯时,发生了新的四组分反应,从而提供了另一种类型的二氢吡喃[2,3-c ]吡唑衍生物。通过4-羟基香豆素/二甲酮/环己烷-1,3-的一锅三组分反应(3CR),也开发了一种高效且实用的吡喃并[3,2- c ]香豆素和4 H-色烯骨架的方法。二酮,乙炔二羧酸二烷基酯和烷基腈。铜铁2 O 4通过简单有效的柠檬酸络合物方法制备了磁性纳米粒子,并利用XRD,FT-IR,EDX和TEM图像对其进行了表征。将该催化剂循环六次,其催化活