One-Pot Synthesis of 2-Arylquinazolines and Tetracyclic Isoindolo[1,2-<i>a</i>]quinazolines<i>via</i>Cyanation Followed by Rearrangement of<i>ortho</i>-Substituted 2-Halo-<i>N</i>-arylbenzamides
作者:Sachin D. Gawande、Manoj R. Zanwar、Veerababurao Kavala、Chun-Wei Kuo、R. R. Rajawinslin、Ching-Fa Yao
DOI:10.1002/adsc.201400505
日期:2015.1.12
2‐arylquinazoline derivatives and tetracylic isoindolo[1,2‐a]quinazoline via cyanation followed by rearrangement of ortho‐substituted 2‐halo‐N‐arylbenzamides is described. Using dimethyl sulfoxide (DMSO) as the solvent, the cleavage of the tetracyclic isoindole fused quinazoline leads to the formation of 2‐arylquinazoline derivatives. When 1,4‐dioxane is used as the solvent, tetracyclic isoindole fused
通过氰化一锅法合成取代的2-芳基喹唑啉衍生物和四环异吲哚并[1,2- a ]喹唑啉,然后重排邻位取代的2-卤代N描述了芳基苯甲酰胺。使用二甲亚砜(DMSO)作为溶剂,四环异吲哚稠合的喹唑啉的裂解会导致2芳基喹唑啉衍生物的形成。当使用1,4-二恶烷作为溶剂时,四环异吲哚稠合的喹唑啉的收率很高。使用DMSO作为溶剂,可以中等至良好的产率生产包括2-苯基喹唑啉-4-胺,4-甲基-2-苯基喹唑啉和长链2-苯基-4-苯乙烯基喹唑啉衍生物在内的多种产品。但是,当使用1,4-二恶烷作为溶剂时,可以得到高收率的各种四环异吲哚稠合的喹唑啉衍生物。
(±)-2-Aryl-2,3-dihydro-4(1H)-quinolinones by a tandem reduction-Michael addition reaction
作者:Richard A. Bunce、Baskar Nammalwar
DOI:10.1002/jhet.624
日期:2011.5
(±)‐2‐aryl‐2,3‐dihydro‐4(1H)‐quinolinones has been developed from chalcones prepared from 2′‐nitroacetophenone and a series of substituted benzaldehydes. The cyclization sequence is initiated by reduction of the nitro group under dissolving metal conditions using iron powder in concentrated hydrochloric acid. Milder conditions, using acetic acid or acetic acid–phosphoric acid as the reaction medium, were less
Herein, a one-pot desulfonylative protocol enabled by copper(II)/zinc(II) salts to accesspyrrolo[2,3-b]quinolines in good to excellent yields from 2-carbonylanilines and ynamide-derived buta-1,3-diynes has been reported. Significantly, various 2-carbonylanilines carrying reactive functional groups are well tolerated. Moreover, a gram-scale synthesis and synthetic application highlight the practical
本文中,通过铜(II)/锌(II)盐实现的一锅脱磺酰化方案能够以良好至优异的产率从2-羰基苯胺和炔酰胺衍生的buta-1,3-获得吡咯并[2,3- b ]喹啉。已有报道称二炔。值得注意的是,各种带有反应性官能团的 2-羰基苯胺具有良好的耐受性。此外,克级合成和合成应用突出了当前协议的实用性。值得注意的是,吡咯并[2,3- b ]喹啉的荧光特性已被记录,并且它们作为活细胞成像中的荧光探针的潜在用途已被证明。
Using Quinolin-4-Ones as Convenient Common Precursors for a Metal-Free Total Synthesis of Both Dubamine and Graveoline Alkaloids and Diverse Structural Analogues
current studies on the synthesis and chemical transformation of 2-aminochalcones, we are reporting here an efficient metal-free approach for the total synthesis of alkaloids 1 and 2 along with their analogues with structural diversity, through a two-step sequence involving intramolecular cyclization, oxidation/aromatization, N-methylation and oxidative C-C bond processes, starting from dihydroquinolin-4-ones