Synthesis of new 2<i>H</i>,4<i>H</i>-benzopyrano[3,4-<i>b</i>]yridine-1,3,5-trione derivatives<i>via</i>carbon suboxide
作者:Leonardo Bonsignore、Giuseppe Loy
DOI:10.1002/jhet.5570350122
日期:1998.1
The new 2H,4H-[1]benzopyrano[3,4-b]pyridine-1,3,5-trione derivatives 10a-f were prepared in the following three steps: first the preparation of new N-(tert-butoxycarbonyl)-3-amino-2H-1-benzopyran-2-one derivatives 5a-f by reaction of coumarin-3-carboxylic acids and diphenylphosphorylazide, then hydrolysis of 5a-f with gaseous hydrogen chloride to give the corresponding amines 7a-f, and finally the
新的2 ħ,4 ħ - [1]苯并吡喃并[3,4- b ]吡啶-1,3,5-三酮衍生物10A-F在以下三个步骤制备:新的第一制备ñ - (叔-通过香豆素-3-羧酸与二苯基磷酰叠氮化物的反应,然后将5a-f与气态氯化氢水解,得到相应的胺7a-(丁氧基羰基)-3-氨基-2 H -1-苯并吡喃-2-酮衍生物5a-f。f,最后在路易斯酸存在下,通过7a-f与亚氧化碳的反应制备10a-f。
Oxidative cross coupling reaction mediated by I<sub>2</sub>/H<sub>2</sub>O<sub>2</sub>: a novel approach for the construction of fused thiazole containing coumarin derivatives
作者:Md. Belal、Abu T. Khan
DOI:10.1039/c5ra20405d
日期:——
Various 2-phenyl-4H-chromeno(3,4-d)thiazol-4-one derivatives have been synthesized through C–H bond activation using sodium sulfide as a source of sulfur atoms and by employing I2 as a catalyst and H2O2 as the terminal oxidant.
Synthesis of Chromeno[3,4‐
<i>b</i>
]pyrrol‐4(3
<i>H</i>
)‐ones through the Domino Cyclization of 3‐Aminocoumarins with Arylglyoxal Monohydrates
作者:Xiaofeng Yang、Zhiwei Chen、Weihui Zhong
DOI:10.1002/ejoc.201700054
日期:2017.4.26
A domino cyclization reaction was developed for the synthesis of two libraries of chromeno[3,4‐b]pyrrol‐4(3H)‐one derivatives by employing 3‐aminocoumarins and arylglyoxal monohydrates in the presence of para‐toluenesulfonic acid (p‐TSA) as a promoter. Toluene and ethanol served important roles in the selective formation of these derivatives characterized by their different substitution patterns.