Copper(II) Anchored on Amine-Functionalized MMT: A Highly Efficient Catalytic System for the One-Pot Synthesis of Bispyrano[2,3-c]pyrazole Derivatives
作者:Majid Ahmadzadeh、Masoud Sadeghi、Javad Safari
DOI:10.1155/2021/1784142
日期:2021.8.13
phenyl hydrazine), malononitrile, β-ketoester, and terephthalaldehyde (or isophthalaldehyde) toward the synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives. From the viewpoint of green chemistry, the advantages of this approach are accessibility, simplicity, and high yields synthesis. The catalyst was recycled and reused four times without significant loss of activity.
An Efficient and Green Synthesis of 6-Amino-3-phenyl-4-aryl-1,4-dihydropyrano [2,3-<i>c</i>]pyrazole-5-carbonitrile Derivatives under Ultrasound Irradiation in Aqueous Medium
作者:Yi Zou、Yu Hu、Hai Liu、Da-Qing Shi
DOI:10.1002/jhet.1627
日期:2013.8
A facile and eco‐friendly approach for the synthesis of 6‐amino‐3‐phenyl‐4‐aryl‐1,4‐dihydropyrano[2,3‐c]pyrazole‐5‐carbonitrile derivatives via four‐component reaction of hydrazine, ethyl 3‐oxo‐3‐phenylpropanoate, aldehydes, and malononitrile is described. The reaction is performed in water, without using any catalyst, and underultrasoundirradiation. The developed sonochemical‐assisted multi‐component
通过肼,乙基四组分反应合成6-氨基-3-苯基-4-苯基-4-芳基-1,4-二氢吡喃[2,3 - c ]吡唑-5-腈的简便而环保的方法描述了3-氧代-3-苯基丙酸酯,醛和丙二腈。该反应在水中,不使用任何催化剂,并在超声辐射下进行。与常规方法相比,已开发的声化学辅助多组分反应提供了改进和加速的转化。
CeCl3-promoted one-pot synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives
作者:Keyume Ablajan、Li-Ju Wang、Zulipiya Maimaiti、Yong-Ting Lu
DOI:10.1007/s00706-013-1104-6
日期:2014.3
AbstractA simple and efficient method was developed for the synthesis of multisubstituted bispyrano[2,3-c]pyrazole derivatives via one-pot reaction of β-keto esters, hydrazine (or phenylhydrazine), terephthalaldehyde, and malononitrile in the presence of CeCl3·7H2O (10 mol%) as a catalyst. This method provides the products in good yields after a simple workup procedure without further purification
摘要开发了一种简单有效的方法,在存在CeCl 3 ·的情况下,通过β-酮酸酯,肼(或苯肼),对苯甲醛和丙二腈的一锅反应,合成多取代的双吡喃并[2,3- c ]吡唑衍生物。 7H 2 O(10 mol%)作为催化剂。通过简单的后处理步骤,该方法无需进一步纯化即可提供高收率的产物。 图形概要