首次描述了喹唑啉-4(3 H )-与苄基卤化物和烯丙基卤化物的有效且可见光促进的级联N-烷基化/酰胺化,以提供对喹唑啉-2,4(1 H)的便捷途径,3 H )-二酮。这种级联N-烷基化/酰胺化反应显示出良好的官能团耐受性,也可应用于 N-杂环,如苯并 [ d ] 噻唑、苯并 [ d ] 咪唑和喹唑啉。对照实验表明,K 2 CO 3在这种转化中起着重要作用。
Given the importance of quinazolinones and carbonylative transformations, a palladium‐catalyzed four‐component carbonylativecoupling system for the synthesis of diverse 4(3H)‐quinazolinone in a concise and convergent fashion has been developed. Starting from 2‐bromoanilines (1 mmol), trimethyl orthoformate (2 mmol), and amines (1.1 mmol), under 10 bar of CO, the desired products were isolated in good
tert-Butyl Hydroperoxide Promoted the Reaction of Quinazoline-3-oxides with Primary Amines Affording Quinazolin-4(3<i>H</i>)-ones
作者:Jin Luo、Juelin Wan、Lianlian Wu、Lingyun Yang、Tao Wang
DOI:10.1021/acs.joc.2c00898
日期:2022.8.5
synthesis of quinazolin-4(3H)-ones via the reaction of quinazoline-3-oxides with primary amines is described. This approach is demonstrated to be applicable for a broad range of substrates and proceeds efficiently under metal-free and mild reaction conditions employing easily available tert-butyl hydroperoxide as the oxidant. Remarkably, 3-(2-(1H-indol-3-yl) ethyl)quinazolin-4(3H)-one 3w, which was conveniently
介绍了一种通过 quinazolin-3-氧化物与伯胺反应合成 quinazolin-4(3 H )-ones 的有效且简便的方法。这种方法被证明适用于广泛的底物,并且在使用容易获得的叔丁基过氧化氢作为氧化剂的无金属和温和的反应条件下有效地进行。值得注意的是,3-(2-(1 H -indol-3-yl) ethyl)quinazolin-4(3 H )-one 3w是通过该方法方便地以 70% 的收率获得的,是合成生物活性吴茱萸碱和鲁坦平。
Single-atom skeletal editing of 2H-indazoles enabled by difluorocarbene
作者:Yao Zhou、Fuling Chen、Ziru Li、Junjie Dong、Jingnan Li、Bohao Zhang、Qiuling Song
DOI:10.1007/s11426-023-1599-4
日期:2023.7
A novel difluorocarbene promoted single-atom skeletal editing of 2H-indazoles is demonstrated herein. Ethyl bromodifluoroacetate was severed as the difluorocarbene source in the current protocol, facilitating the cleavage of the N−N bond via carbon atom insertion. This metal-free ringexpansionreaction enables the late-stage diversification of indazole skeletons, assembling a diverse array of functionalized