Green Approach to the Design of Functionalized Medicinally Privileged 4-Aryl-1,4-dihydropyrano[2,3-<i>c</i>]-pyrazole-5-carbonitrile Scaffold
作者:Alexey I. Ilovaisky、Michael G. Medvedev、Valentina M. Merkulova、Michail N. Elinson、Gennady I. Nikishin
DOI:10.1002/jhet.1737
日期:2014.3
“On water” multicomponent condensation of aromaticaldehydes, malononitrile, and 3‐methyl‐2‐pyrazoline‐5‐one in the presence of sodiumhydroxide as catalyst leads to 6‐amino‐3‐methyl‐4‐aryl‐1,4‐dihydropyrano[2,3‐c]pyrazole‐5‐carbonitriles in 85–98% yields.
在存在氢氧化钠作为催化剂的情况下,芳香醛,丙二腈和3-甲基-2-吡唑啉-5-酮的“水上”多组分缩合反应会生成6-氨基-3-甲基-4-甲基-4-芳基-1,4-二氢吡喃并[2,3 - c ]吡唑-5-腈的产率为85-98%。
ZnFe<sub>2</sub>O<sub>4</sub> Nanoparticles as a Robust and Reusable Magnetically Catalyst in the four Component Synthesis of [(5-hydroxy-3-methyl-1H-pyrazol-4yl) (phenyl) Methyl]propAnedinitriles and Substituted 6-Amino-Pyrano[2,3-c]Pyrazoles
A simple method has been developed for the synthesis of [(5-hydroxy-3-methyl-1H-pyrazol-4-yl)(phenyl)methyl]propanedinitriles and 6-amino-4-aryl-3-methyl-2,4-dihydro pyrano[2,3-c]pyrazole-5-carbonitrilederivatives through a one-pot four-component condensation reaction of aromatic aldehydes, malononitrile, ethyl acetoacetate and hydrazine hydrate using ZnFe2O4 nanoparticles under solvent-free conditions
Electrocatalytic cyclization of 3-(5-hydroxy-3-methylpyrazol-4-yl)-3-arylpropionitriles: ‘one-pot’ simple fast and efficient way to substituted spirocyclopropylpyrazolones
作者:Anatoly N. Vereshchagin、Michail N. Elinson、Evgeniya O. Dorofeeva、Ruslan F. Nasybullin、Ivan S. Bushmarinov、Alexander S. Goloveshkin、Mikhail P. Egorov
DOI:10.1016/j.electacta.2015.03.015
日期:2015.5
bromide as mediator results in fast and efficient cyclization with the formation of the substituted spirocyclopropylpyrazolones in 60–90% substance yield. The fast (35 min) electrocatalytic reaction smoothly proceeds under neutral and mild conditions. The implication of electrocatalysis in cascade cyclization reaction is an efficientapproach to medicinallyrelevant spirocyclopropylpyrazolones and