Synthesis of quinazolin-4(3H)-ones via electrochemical decarboxylative cyclization of α‑keto acids with 2-aminobenzamides
作者:Qing Tian、Jinli Zhang、Liang Xu、Yu Wei
DOI:10.1016/j.mcat.2020.111345
日期:2021.1
Abstract Herein, an environmentally benign electrochemical protocol has been disclosed for the synthesis of quinazolin-4(3H)-one derivatives from readily available α‑keto acids and 2-aminobenzamides. This decarboxylative cyclization process proceeds conveniently in the absence of any homogeneous metal catalysts, bases, or external oxidants. This protocol also features CO2 by-products, mild reaction
摘要 本文公开了一种环境友好的电化学方案,用于从容易获得的 α-酮酸和 2-氨基苯甲酰胺合成 quinazolin-4(3H)-one 衍生物。这种脱羧环化过程在没有任何均相金属催化剂、碱或外部氧化剂的情况下方便地进行。该协议还具有 CO2 副产物、温和的反应条件(室温和空气气氛)和广泛的底物范围,包括一系列 2,3-二取代喹唑啉酮产品。
α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2-<i>a</i>]quinoxalines, quinazolinones, and other N-heterocycles <i>via</i> decarboxylative oxidative annulation reaction
and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include the in situ generation of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford
开发了一种无金属且有效的合成吡咯并[1,2- a ]喹喔啉、喹唑啉酮和吲哚[1,2- a ]喹喔啉的方法。该方法的主要特点包括在 TBHP(叔丁基过氧化氢)存在下,由 α-羟基酸原位生成醛,并与各种胺进一步缩合,然后进行分子内环化和随后的氧化,得到相应的喹喔啉、喹唑啉酮衍生物,产率中等至高。
Synthesis of 2-aryl quinazolinones <i>via</i> iron-catalyzed cross-dehydrogenative coupling (CDC) between N–H and C–H bonds
作者:Yoonkyung Jang、Seok Beom Lee、Junhwa Hong、Simin Chun、Jeeyeon Lee、Suckchang Hong
DOI:10.1039/d0ob00866d
日期:——
describe the direct synthesis of quinazolinones via cross-dehydrogenative coupling between methylarenes and anthranilamides. The C–H functionalization of the benzylic sp3 carbon is achieved by di-t-butyl peroxide under air, and the subsequent amination–aerobic oxidation process completes the annulation process. Iron catalyzed the whole reaction process and various kinds of functional groups were tolerated
NHC-Catalyzed Benzylic C<sub>sp³</sub>-H Bond Activation of Alkylarenes and<i>N</i>-Benzylamines for the Synthesis of 3<i>H</i>-Quinazolin-4-ones: Experimental and Theoretical Study
作者:Anitha Alanthadka、E. Sankari Devi、Subbiah Nagarajan、Vellaisamy Sridharan、Ambigapathy Suvitha、C. Uma Maheswari
DOI:10.1002/ejoc.201600792
日期:2016.10
catalyzed benzylic Csp³–H bondactivation of alkylarenes and N-benzylamines under metal-free conditions was developed. This organocatalyzed oxidative transformation afforded the corresponding carbonyl derivatives in good to excellent yields. A variety of alkylarenes and N-benzylamines were tolerated under the optimized reaction conditions. The established method was further extended to the synthesis of biologically
Copper-catalyzed redox-neutral C–H amination with amidoximes
作者:Hui Chen、Shunsuke Chiba
DOI:10.1039/c3ob41871e
日期:——
CuI-catalyzed reactions of N-alkylamidoximes afforded dihydroimidazoles via sp3 CâH amination. On the other hand, the reactions of N-benzoylamidoximes resulted in sp2 CâH amination to form quinazolinones. The reaction mechanisms could be characterized as a redox-neutral radical pathway including a Cu(I)âCu(II) redox catalytic cycle.