An efficient three-component synthesis of coumarin-3-carbamides by use of Ni–NiO nanoparticles as magnetically separable catalyst
作者:Nayim Sepay、Chayan Guha、Arpan Kool、Asok K. Mallik
DOI:10.1039/c5ra13932e
日期:——
An efficient and ecofriendly synthesis of coumarin-3-carbamides has been developed by a three-component reaction of 2-hydroxybenzaldehydes, aliphatic amines (p-/s-) and diethyl malonate using Ni–NiO nanoparticles as catalyst.
A New and Efficient Method for the Synthesis of 3,4-Disubstituted Pyrrolidine-2,5-diones
作者:Eleonora D. Ilieva、Nevena I. Petkova、Rositca D. Nikolova
DOI:10.3390/molecules17054936
日期:——
A newly found reaction for the synthesis of 3,4-disubstituted 1-hydroxy-pyrrolidine-2,5-diones from 3-substituted coumarins and nitromethane has been elaborated. The reaction involved a simple and convenient experimental procedure. The applicability of the rearrangement reaction is determined.
Synthesis of benzopyranopyrrolidines via 1,3-dipolar cycloaddition of nonstabilized azomethine ylides with 3-substituted coumarins
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh、Gerd-Volker Röschenthaler
DOI:10.1016/j.tet.2013.05.018
日期:2013.7
three-component reaction of 3-substituted coumarins with N-alkyl-α-amino acids and aldehydes gave 1-benzopyrano[3,4-c]pyrrolidines as a result of a 1,3-dipolarcycloaddition of an intermediate nonstabilized azomethine ylide at the double bond of the coumarin system in moderate to good yields. In most cases, high regio- and stereo-selectivity of the [3+2] cycloaddition was observed.
3-取代的香豆素与N-烷基-α-氨基酸和醛类的三组分反应产生了1-苯并吡喃并[3,4- c ]吡咯烷,这是由于中间体非稳定的甲亚胺基内酯的1,3-偶极环加成反应的结果。在香豆素系统的双键上以中等至良好的产率。在大多数情况下,观察到[3 + 2]环加成反应的高区域选择性和立体选择性。
1,3-Dipolar cycloadditions of nonstabilised azomethine ylides at 3-substituted coumarins: synthesis of 1-benzopyrano[3,4-c]pyrrolidines
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh、Pavel A. Slepukhin、Gerd-Volker Röschenthaler
DOI:10.1016/j.mencom.2012.01.011
日期:2012.1
Reaction of 3-substituted coumarins with N-alkyl-α-amino acids and aldehydes proceeds regio- and stereoselectively to give 1-benzopyrano[3,4-c]pyrrolidines as a result of 1,3-dipolarcycloaddition of the intermediate azomethine ylides at the Δ3-bond of the coumarins.
Piperidine-Iodine as Efficient Dual Catalyst for the One-Pot, Three-Component Synthesis of Coumarin-3-Carboxamides
作者:Manuel Velasco、Nancy Romero-Ceronio、Rosalía Torralba、Oswaldo Hernández Abreu、Miguel A. Vilchis-Reyes、Erika Alarcón-Matus、Erika M. Ramos-Rivera、David M. Aparicio、Jacqueline Jiménez、Eric Aguilar García、David Cruz Cruz、Clarisa Villegas Gómez、Cuauhtémoc Alvarado
DOI:10.3390/molecules27144659
日期:——
efficient one-pot, three-component synthetic method for the preparation of coumarin-3-carboxamides was carried out by the reaction of salicylaldehyde, aliphatic primary/secondary amines, and diethylmalonate. The protocol employs piperidine-iodine as a dual system catalyst and ethanol, a green solvent. The main advantages of this approach are that it is a metal-free and clean reaction, has low catalyst loading