Via an imine-protection strategy, we herein present an unprecedented copper-catalyzed oxidative multicomponent annulation reaction for directsynthesis of quinazolinones. The construction of various products is achieved via formation of three C–N and one C–C bonds in conjunction with the benzylic functionalization. The merits of easily available feedstocks, naturally abundant catalyst, good functional
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。
Application of <i>N</i>,<i>N</i>-Dimethylethanolamine as a One-Carbon Synthon for the Synthesis of Pyrrolo[1,2-<i>a</i>]quinoxalines, Quinazolin-4-ones, and Benzo[4,5]imidazoquinazolines <i>via</i> [5 + 1] Annulation
作者:Meiqi Geng、Minzhao Huang、Jinqiang Kuang、Weiwei Fang、MaoZhong Miao、Yongmin Ma
DOI:10.1021/acs.joc.2c02079
日期:2022.11.4
synthetic chemistry. In this report, a Cu(II)-catalyzed green and efficient synthesis of pyrrolo[1,2-a]quinoxaline, quinazolin-4-one, and benzo[4,5]imidazoquinazoline derivatives was developed, employing N,N-dimethylethanolamine (DMEA) as a C1 synthon. Green oxidant O2 is critical in these transformations, facilitating the formation of a keyintermediate─a reactive iminium ion. The method conducted
N-杂环的合成是合成化学的重要组成部分。在本报告中,采用N,N-二甲基乙醇胺开发了 Cu(II) 催化绿色高效合成吡咯并[1,2 - a ]喹喔啉、喹唑啉-4-酮和苯并[4,5]咪唑并喹唑啉衍生物(DMEA) 作为 C1 合成子。绿色氧化剂 O 2在这些转化过程中至关重要,它促进了关键中间体的形成——活性亚胺离子。在温和条件下进行的方法与多种功能组兼容,为以前开发的协议提供了一个有吸引力的替代方案。
Georgescu, Florentina; Georgescu; Caproiu, Miron T., Revue Roumaine de Chimie, 1999, vol. 44, # 4, p. 341 - 350
作者:Georgescu, Florentina、Georgescu、Caproiu, Miron T.、Draghici, Constantin