Studies on Quinazolines. VII. Reactions of Anthranilamide with .BETA.-Diketones; New Approaches toward the Synthesis of Tetrahydropyrido(2,1-b)quinazolin-11-one Derivatives.
Studies on Quinazolines. VII. Reactions of Anthranilamide with .BETA.-Diketones; New Approaches toward the Synthesis of Tetrahydropyrido(2,1-b)quinazolin-11-one Derivatives.
Synthesis of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones catalyzed by graphene oxide nanosheets in an aqueous medium: “on-water” synthesis accompanied by carbocatalysis and selective C–C bond cleavage
作者:Nazia Kausar、Indranil Roy、Dipankar Chattopadhyay、Asish R. Das
DOI:10.1039/c6ra00388e
日期:——
Graphene oxide (GO) nanosheet catalyzed new and straightforward strategies for the construction of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones starting from anthranilamide (2-aminobenzamide) and an aldehyde/ketone in aqueous medium at room temperature have been realized. This catalyst is also found to be efficient for the expedient construction of quinazolin-4(3H)-ones starting from anthranilamide
and green approach was developed for the synthesis of 4(3H)-quinazolinones by using camphorsulfonic acid as a catalyst in an aqueous solution of biodegradable ethyl lactate. Various 2-aryl-, 2-alkyl-, and 2-(4-oxoalkyl)quinazolinones were obtained by cyclization of 2-aminobenzamides with a wide range of acyclic or cyclic 1,3-diketones via C–C bond cleavage in satisfactory to excellent yields.
1,2-Dihydro-4-chinazolinone aus Anthranilamiden und Oxoverbindungen – Untersuchungen zum Reaktionsverlauf der Ringschlußreaktion
作者:Jürgen Lessel
DOI:10.1002/ardp.19943270905
日期:——
Das Erhitzen der Anthranilsäureamide 1a‐c mit Oxoverbindungen ohne Solvens erlaubt die Synthese der 1,2‐Dihydro‐4‐chinazolinone 8–25, unter drastischeren Bedingungen erfolgt bei β‐Dicarbonylverbindungen eine Eliminierung zu den Methylchinazolinonen 26/27; die Reaktionen verlaufen thermodynamisch kontrolliert. Die aus cyclischen β‐Diketonen erhaltenen Enaminone 28/29 erfahren in Eisessig eine Ringtransformation
deoxyvasicinone analogues were obtained from 2-(4-oxopentyl)quinazolin-4(3H)-ones via different process of linear cyclizations. The first was 1-acetyl-2,3-dihydropyrrolo[2,1-b]quinazolin-9(1H)-one analogue derived from direct cyclization in the presence of I2 in basic condition. The other was 1-acetylpyrrolo[2,1-b]quinazolin-9(3H)-one analogue obtained from two-step procedures beginning with geminal
通过不同的线性环化过程,从 2-(4-oxopentyl)quinazolin-4(3 H )-ones中获得了两种 deoxyvasicinone 类似物。第一个是 1-acetyl-2,3-dihydropyrrolo[2,1- b ]quinazolin-9(1 H )-一种在碱性条件下在 I 2存在下直接环化衍生的类似物。另一种是 1-acetylpyrrolo[2,1- b ]quinazolin-9(3 H )-一种通过两步程序获得的类似物,首先在酸性条件下进行孪生二氯化,然后在对位存在的情况下形成分子内 C N 键甲苯磺酸。