Copper-Catalyzed Tandem Dehydrocyanation and [3+2] Cycloaddition Reactions of Phenacylmalononitriles: Regioselective Synthesis of Functionalized 4-Benzoyl-5-cyanopyrazoles under Mild Conditions
作者:Issa Yavari、Omid Khaledian
DOI:10.1055/s-0039-1691591
日期:2020.5
A novel copper-catalyzed [3+2] cycloaddition reaction with concomitant in situ generation of benzoylacrylonitriles and nitrile imines from phenacylmalononitriles and hydrazonoyl chlorides, respectively, is reported. The reaction was performed using copper(I) chloride as catalyst and N-methylimidazole as a clean complexing agent/weak base to afford the functionalized 4-benzoyl-5-cyanopyrazoles in moderate
Synthesis and biological assessment of diversely substituted furo[2,3-b]quinolin-4-amine and pyrrolo[2,3-b]quinolin-4-amine derivatives, as novel tacrine analogues
作者:Carla Martins、M. Carmo Carreiras、Rafael León、Cristóbal de los Ríos、Manuela Bartolini、Vincenza Andrisano、Isabel Iriepa、Ignacio Moraleda、Enrique Gálvez、Manuela García、Javier Egea、Abdelouhaid Samadi、Mourad Chioua、José Marco-Contelles
DOI:10.1016/j.ejmech.2011.09.038
日期:2011.12
The synthesis and pharmacological analyses of a number of furo[2,3-b]quinolin-4-amine, and pyrrolo[2,3-b]quinolin-4-amine derivatives are reported. Thus, we synthesized diversely substituted tacrine analogues 1–11 and 12–16 by Friedländer-type reaction of readily available o-amino(furano/pyrrolo)nitriles with suitable and selected cycloalkanones. The biological evaluation of furanotacrines 1–11 and
报道了许多呋喃并[2,3 - b ]喹啉-4-胺和吡咯并[2,3 - b ]喹啉-4-胺衍生物的合成和药理学分析。因此,我们合成了不同地取代的他克林的类似物1 - 11和12 - 16由容易获得的德兰德型反应ø -氨基(呋喃/吡咯)与合适的和选定的环烷酮腈。的生物学评价furanotacrines 1 - 11和pyrrolotacrine 13表明,这些都是很好的,在微摩尔范围内,和丁酰胆碱酯酶的高度选择性抑制剂。在呋喃诺那林中组中,最有趣的抑制剂是2-(对甲苯基)-5,6,7,8-四氢呋喃[2,3- b ]喹啉-4-胺(3)[IC 50(eqBuChE)= 2.9±0.4μM ; IC 50(hBuChE)= 119±15μM]。相反,吡咯烷酮 12和14被证明对两种胆碱酯酶具有中等等价性,分别是1,2-二苯基-5,6,7,8-四氢-1 H-吡咯并[2,3 - b ]喹啉-4-胺(12)。对两种酶的抑制作用最强[IC
One-Pot Synthesis of Substituted 2-Amino-3-Furonitriles
Solvent-free reaction of substituted α-haloketones with malononitrile in the presence of diethylamine provides an efficient one-pot synthesis of 2-amino-5-aryl (alkyl)-3-furonitriles in high yield.
The synthesis of novel dihydroindoles 8a-d and 9a-d bearing electron-withdrawing groups at C-2 position is presented. The key step of this approach is an efficient intramolecular Diels-Alder reaction of N-alkenylated 2-amino-3-furancarbonitriles 4a-d and 5a-d.
Synthesis of Dihydroindoles and Tetrahydroquinolines by the Intramolecular Diels-Alder Reaction of N-Alkenylated 2-Acylamino-3-furancarbonitriles
An approach to dihydroindoles and tetrahydroquinolines from N-alkenylated 2-acylamino-3-furancarbonitriles via a [4 + 2] cycloaddition reaction is described. Thermal treatment of N-alkenylated 2-acylamino-3-furancarbonitriles 5a-d, 6a-d, 9a-d, and 10a-d, which were prepared from 2-acylamino-3-furancarbonitriles 3a-d and/or 4a-d and 4-bromo-1-butene and/or 5-bromo-1-pentene, caused an intramolecular Diels-Alder reaction to give the corresponding dihydroindole and tetrahydroquinoline derivatives 7a-d, 8a-d, 11a-d, and 12a-d. This method has the advantage of easier work-up procedure.