catalyst for the synthesis of a series of pyranopyrazole derivatives via a one-pot, four-component reaction of carbonyl compound or isatin, hydrazine hydrate, malononitrile, and β-keto ester in EtOH–H2O. The catalyst was found to work extremely for aldehydes, ketones or isatins at room temperature to give the corresponding dihydropyrano[2,3-c]pyrazole or spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives
证明葡甲胺是一种生物基化学物质,它是通过羰基化合物或靛红,水合肼,丙二腈和β的单锅四组分反应合成一系列吡喃并吡唑衍生物的高效且可重复使用的催化剂。酮的EtOH-H酯2 O.将催化剂在室温下发现极其对醛,酮或靛红工作以得到相应的二氢吡喃并[2,3- c ^ ]吡唑或螺[二氢吲哚-3,4'-吡喃并并[2,3- c ^ ]吡唑]衍生物以高产率。这个新方法的显着特点是广泛的底物范围,室温下的反应条件,反应时间短,产量高,容易进行后处理过程中,催化剂的可重用性,并且不存在有害的有机溶剂。
Using magnetized water as a solvent for a green, catalyst-free, and efficient protocol for the synthesis of pyrano[2,3-c]pyrazoles and pyrano[4′,3′:5,6]pyrazolo [2,3-d]pyrimidines
A facile, eco-friendly, and highly efficient one-pot four-component protocol is demonstrated for the synthesis of the pyrano[2,3-c]pyrazole and pyrano[4′,3′:5,6]pyrazolo [2,3- d ]pyrimidine derivatives using magnetized water as a newgreen solvent. Simplicity, short reaction time, high yield, easy work-up, and absence of hazardous organic solvents are the main advantages of this method .
已证明一种简便,环保,高效的一锅四组分方案可用于合成吡喃并[2,3-c]吡唑和吡喃并[4',3':5,6]吡唑并[2, 3- d ]嘧啶衍生物,使用磁化水作为新的绿色溶剂。该方法的主要优点是操作简便,反应时间短,收率高,后处理简便且无有害有机溶剂。
A facile synthesis of 6-amino-2H, 4H-pyrano[2,3-с]pyrazole-5-carbonitriles in deep eutectic solvent
作者:Manisha R. Bhosle、Lalit D. Khillare、Sambhaji T. Dhumal、Ramrao A. Mane
DOI:10.1016/j.cclet.2015.12.005
日期:2016.3
Abstract A convenient synthesis of 6-amino-2 H ,4 H -pyrano[2,3- с ]pyrazole-5-carbonitriles has been accomplished by onepot four-component cyclocondensation of aromatic aldehydes ( 1a-o ) malanonitrile ( 2 ), ethyl acetoacetate ( 3 ), and hydrazine hydrate ( 4 ) in freshly prepared deepeutecticsolvent, DES (choline chloride:urea). This protocol has afforded corresponding pyrano[2,3- с ]pyrazoles
Ultrasound Mediated, Sodium Bisulfite Catalyzed, Solvent Free Synthesis of 6-Amino-3-methyl-4-substitued-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile
作者:Sunil N. Darandale、Jaiprakash N. Sangshetti、Devanand B. Shinde
DOI:10.5012/jkcs.2012.56.3.328
日期:2012.6.20
A simple, convenient and practical green synthetic protocol for sodium bisulfite catalyzed multicomponent reaction of ethyl acetoacetate, hydrazine hydrate, malononitrile, and various aldehydes for the synthesis of 6-amino-4-phenyl-3-methyl-2,4-ihydropyrano[2,3-c]pyrazole-5-carbonitriles using ultrasound irradiations in solvent free condition. This method provides the advantage of operational simplicity, shorter reaction time and excellent yields making the protocol environment friendly and economically lucrative.
Cu(<scp>ii</scp>) immobilized on poly(guanidine-sulfonamide)-functionalized Bentonite@MgFe<sub>2</sub>O<sub>4</sub>: a novel magnetic nanocatalyst for the synthesis of 1,4-dihydropyrano[2,3-<i>c</i>]pyrazole
In this paper, we aim at synthesizing a new nanocomposite material in which bentonite acts as a nucleation site for MgFe2O4nanoparticles precipitation in the attendance of an external magnetic field (MgFe2O4@Bentonite).