DBU-Catalyzed, facile and efficient method for synthesis of spirocyclic 2-oxindole derivatives with incorporated 6-amino-4H-pyridazines and fused derivatives via [3+3] atom combination
作者:Ismail A. Abdelhamid、Mona H. Mohamed、Amr M. Abdelmoniem、Said A.S. Ghozlan
DOI:10.1016/j.tet.2009.09.081
日期:2009.11
3-Cyanomethylidene oxindole derivatives were prepared in excellent yields utilizing DBU-promoted Knoevenagelcondensation of isatin derivatives with active methylene reagents. The isolated products were then reacted with azaenamines via a DBU-promoted Michael addition to yield spirocyclic 2-oxindole derivatives with incorporated 6-amino-4H-pyridazines and their fused derivatives.
Simple and Clean Procedure for Three-Component Syntheses of Spiro{pyrido[2,1-<i>b</i>]benzothiazole-3,3′-indolines} and Spiro{thiazolo[3,2-<i>a</i>]pyridine-7,3′-indolines} in Aqueous Medium
作者:Essam M. Hussein、Ahmed M. El-Khawaga
DOI:10.1002/jhet.908
日期:2012.11
A simple and efficient one‐pot three component synthesis of spiropyrido[2,1‐b]benzothiazole‐3,3′‐indoline} and/or spirothiazolo[3,2‐a]pyridine‐7,3′‐indoline} derivatives were carried out by the reaction of 2‐mercaptoaniline and/or mercaptoacetic acid, malononitrile, and a series of 2‐oxoindoline‐3‐ylidines in aqueousmedium. This method is of great value because of its environmentally benign character
简单高效的螺rid pyrido [ 2,1 – b ]苯并噻唑-3,3'-二氢吲哚}和/或螺3噻唑[3,2 - a ]吡啶-7,3'-的一锅三组分合成indoline}衍生物是通过2-巯基苯胺和/或巯基乙酸,丙二腈和一系列2-oxoindoline-3-ylidines在水性介质中反应而生成的。该方法由于其对环境有益的特性,高产量的处理和易于处理而具有很大的价值。
Reaction of Isatins with Active Methylene Compounds on Neutral Alumina: Formation of Knoevenagel Condensates and Other Interesting Products
and 5-nitro derivatives underwent smooth reaction with a variety of acyclic and cyclic active methylene compounds on neutral alumina at rt to efficiently furnish Knoevenagel condensates in the majority of the cases and tandem Knoevenagel condensation-Michael addition products including spiro compounds in two cases.
Synthesis of 2,6′-Dioxo-1′,5′,6′,7′-tetrahydrospiro[indoline-3,4′-pyrazolo[3,4-<i>b</i>]pyridine]-5′-carbonitriles via a One-Pot, Three-Component Reaction in Water
A one-pot, three-component condensation reaction of an isatin, aminopyrazole, and alkyl cyanoacetate in water to give 2,6′-dioxo-1′,5′,6′,7′-tetrahydrospiro[indoline-3,4′-pyrazolo[3,4-b]pyridine]-5′-carbonitrile with good yields, at 90 °C, using a Et3N as catalyst, is described.
靛红,氨基吡唑和氰基乙酸烷基酯在水中的一锅三组分缩合反应,得到2,6'-dioxo-1',5',6',7'-四氢螺[吲哚啉-3,4'描述了在90℃下使用Et 3 N作为催化剂具有良好收率的-吡唑并[3,4- b ]吡啶] -5′-腈。
An efficient one-pot, three-component synthesis of 6-cyano-hexahydro-4$H$-thieno[3'',2'':5,6]pyrimido[1,2-$a$]quinoline-2-carboxylates and their spiro derivatives from $\beta $-enaminones
作者:Said Ahmed Soliman GHOZLAN、Doaa Mohamed ABDELMONIEM、Amr Mohamed ABDELMONIEM、Ismail Abdelshafy ABDELHAMID
DOI:10.3906/kim-1507-31
日期:——
A simple and efficient one-pot synthesis of novel thieno[3',2':5,6]pyrimido[1,2-a]quinoline-2-carboxylates (5a-d) and their spirooxindole derivatives (12a-d) was accomplished. Thus, the Michael addition reaction of the cyclic $\beta $-enaminone 3 with the corresponding $\alpha ,\beta $-unsaturated nitrile derivatives 4a-d in refluxing EtOH in the presence of piperidine afforded 5a-d in good yields. On the other hand, spirooxindole derivatives 12a-d were synthesized by the reaction of cyclic $\beta $-enaminone 3 with the corresponding 3-cyanomethylidene-2-oxoindoles 11a-d in refluxing EtOH.