Novel Chromeno[2,3-b]pyridines from Basic Rearrangement of 4-Oxo-chromene-3-carbonitrile
作者:Magdy A. Ibrahim
DOI:10.1080/00397910902788141
日期:2009.9.8
Abstract A new series of 2,3-disubstituted-5-oxochromeno[2,3-b]pyridine derivatives has been obtained throughout a 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-catalyzed reaction of 4-oxo-4H-chromene-3-carbonitrile with various active methyl and methylene compounds. The Friedländer reaction of 2-amino-4-oxo-4H-chromene-3-carboxaldehyde with the same active methyl and methylene compounds led to the identical
One pot synthesis of new benzopyranopyridines via Friedlander condensation
作者:Zeba N. Siddiqui
DOI:10.1016/j.tetlet.2012.07.013
日期:2012.9
synthetic route to new benzopyrano [2,3-b] pyridines in excellent yield via Friedlander condensation has been developed by the reaction of 2-amino-3-formylchromone 1a–b and cyclic active methylene compounds 2a–e in the presence of Zn(l-proline)2 as an efficient, stable, and inexpensive Lewisacidcatalyst in water. The present methodology offers several advantages such as shorter reaction time, mild reaction
通过2-氨基-3-甲酰基色酮1a - b与环状活性亚甲基化合物2a - e在苯胺中的反应,开发了一种通过弗里德兰德缩合反应以高收率获得新的苯并吡喃并[2,3- b ]吡啶的简便,绿色的合成途径。 Zn(1-脯氨酸)2作为有效,稳定和廉价的路易斯酸催化剂在水中的存在。本方法提供了许多优点,例如较短的反应时间,温和的反应条件,简单的操作程序,可循环使用的催化剂以及对环境安全。
Construction, characterization, and antimicrobial evaluation of the novel heteroannulated chromeno[2′′,3′′:6′,5′]pyrido[2′,3′‐
<i>d</i>
] [1,3] thiazolo[3,2‐
<i>a</i>
]pyrimidines
作者:Magdy A. Ibrahim、Sami A. Al‐Harbi、Esam S. Allehyani
DOI:10.1002/jhet.4163
日期:2021.1
and oxalyl chloride afforded the first known chromenopyridothiazolopyrimidines. Cyclization of the starting compound with 2,3‐dichloroquinoxaline gave the linear hepta‐annulated chromenopyridopyrimidothiazoloquinoxaline. In addition, chromenopyridopyrimido thiazolopyrimidines were efficiently synthesized. The antimicrobial activity was evaluated for the prepared compounds and some of them seemed notable
色酮-3-腈与硫代巴比妥酸反应,得到2-硫代邻苯二酚色[3',2':5,6]吡啶[2,3 - d ]嘧啶-4,6(1 H,3 H)-二酮,用作构建含有异色吡啶并恶唑并嘧啶部分的新型异环化合物的结构单元。起始化合物与多种双亲试剂的反应为:氯乙腈,溴代丙二腈,3-氯戊二酮,2-氯-3-氧代丁酸乙酯,苯甲酰溴,氯乙酸,二溴乙烷和草酰氯提供了第一个已知的铬吡啶并并噻唑并吡咯并嘧啶。用2,3-二氯喹喔啉对起始化合物进行环化,得到线性七环化的铬吡啶并吡啶并嘧啶并噻唑并喹喔啉。此外,有效地合成了铬吡啶并吡啶并嘧啶基噻唑并嘧啶。评价了所制备化合物的抗微生物活性,其中一些似乎对被测微生物具有显着活性。