A B2(OH)4-Mediated Synthesis of 2-Substituted Indazolone and Its Application in a DNA-Encoded Library
摘要:
Indazolone cores are among the most common structural components in medicinal chemistry and can be found in many biologically active molecules. In this report, a mild and efficient approach to 2-substituted indazolones via B-2(OH)(4)-mediated reductive N-N bond formation is developed. This strategy features mild conditions, no request for a metal catalyst, and a wide scope for both aliphatic and aromatic amines. Meanwhile, this method was further successfully applied on DNA to construct indazolone cores for a DNA-encoded library. This will enable the production of a very attractive indazolone-cored library from simple amines and scaffolds, which will provide considerable diversity.
Abstract A new method for the synthesis of 1-arylindazolones and 2-arylindazolones from N′-aryl-2-halobenzohydrazides promoted by KOt-Bu was developed. The difference of 2-halogen substituent exerted a significant effect on the distribution of the products. Two distinct reaction pathways are proposed for the generation of 1-arylindazolones and 2-arylindazolones, respectively. A new method for the synthesis
摘要 提出了由KO t -Bu促进的N'-芳基-2-卤代苯并肼合成N-芳基-2-卤代苯并肼合成1-芳基吲哚酮和2-芳基吲哚酮的新方法。2-卤素取代基的差异对产物的分布具有显着影响。提出了两种不同的反应途径分别用于生成1-芳基吲哚酮和2-芳基吲哚酮。 提出了由KO t -Bu促进的N'-芳基-2-卤代苯并肼合成N-芳基-2-卤代苯并肼合成1-芳基吲哚酮和2-芳基吲哚酮的新方法。2-卤素取代基的差异对产物的分布具有显着影响。提出了两种不同的反应途径分别用于生成1-芳基吲哚酮和2-芳基吲哚酮。
Palladium-Catalyzed Carbonylative Cyclization of Azoarenes
CO-n game: An efficient protocol for the palladium-catalyzed carbonylation of azobenzenes is established through C(sp2)−H bond activation with Mo(CO)6 as the solid CO source. Reactions of both symmetrical and unsymmetrical azobenzenes proceed efficiently by this procedure with high regioselectivity. BQ=p-benzoquinone.
Synthesis of Indazolo[2,1-a]Cinnolines via Rhodium (III)-Catalyzed C–H activation/annulation under mild conditions
作者:Wei Hou、Huan Xiong、Ruisong Bai、Zaozao Xiao、Lin Su、Bengfang Helen Ruan、Hongtao Xu
DOI:10.1016/j.tet.2019.06.021
日期:2019.7
A simple, robust and efficient Rh(III)-catalyzed synthesis of novel 12H-indazolo[2,1-a]cinnolin-12-ones has been developed via tandem C–H activation/annulation of 2-phenylindazolones with diazo compounds by using less developed secondary amine as an intrinsic directing group. Notably, a series of nondiscriminating conditions were obtained with excellent test yield. Also, this reaction is highly regioselective
通过串联重活化2-苯基吲唑酮与重氮化合物的CH-H活化/环化反应,已开发出一种简单,可靠且有效的Rh(III)催化合成新型12H-吲唑并[2,1- a ] cinnolin -12-ones。较不发达的仲胺作为内在的指导基团。值得注意的是,以优异的测试产率获得了一系列非歧视条件。同样,该反应在区域范围很广的情况下具有很高的区域选择性,给电子基团和吸电子基团在非常温和的条件下(室温至40°C)都能获得令人满意的产率。它具有可扩展性,与空气和H 2 O兼容,唯一的副产物是N 2和H 2O.此外,合成产物代表一类新的荧光团,并且已经进行了它们的初始光谱表征。
Meeting organometallic chemistry with drug discovery: C H activation enabled discovery of a new ring system of 12H-Indazolo[2,1-a]cinnolin-12-ones with anti-proliferation activity
A diverse library of newringsystem 12H-indazolo[2,1-a]cinnolin-12-ones have been synthesized efficiently via Ru (II) and Rh (III) catalyzed tandem CH alkylation/[4 + 2] annulation with diazo compounds in high to excellent yields. For the first time, we evaluated the biological activity of these compounds with this new skeleton and found some compounds exhibited high cytotoxic activity against human
Synthesis and Anti-Inflammatory Activity of N(2)-Arylindazol-3(2H)-One Derivatives: Copper-Promoted Direct N-Arylation via Chan–Evans–Lam Coupling
作者:Kyungmin Kim、Jeong Ho Kim、Heejae Choi、Byeongno Lee、Jihyun Lee、Kang Min Ok、Tae Hoon Lee、Hakwon Kim
DOI:10.3390/molecules28186706
日期:——
compounds. In this study, we present a highly efficient synthetic method for direct N-arylation to produce a variety of N(2)-arylindazol-3(2H)-ones3, which exhibit anti-inflammatory activity. The Chan–Evans–Lam (CEL) coupling of N(1)-benzyl-indazol-3-(2H)-ones 1 with arylboronic acids 2 in the presence of a copper complex provided the corresponding N(2)-arylindazol-3(2H)-ones3 in good-to-excellent