在无金属和无化学氧化剂的条件下开发了一种高效的电化学双C(sp 3 )–H胺化反应。可以高产率得到一系列咪唑并[1,5- a ]喹唑啉-5( 4H )-酮和5-氧代-4,5-二氢咪唑并[1,5- a ]喹唑啉-3-甲腈。可以借助该方法来调节产品分布。考察了反应机理并研究了相应的中间体。该反应具有底物范围广、产物分布可控、条件温和、制备规模化等特点。
Synthesis of N-Heteropolycyclic Compounds Including Quinazolinone Skeleton Using Friedel–Crafts Alkylation
摘要:
A simple method to synthesize N-heteropolycyclic quinazolinones was developed including Knoevenagel condensation of quinazolines and aldehydes and Friedel-Craft alkylation as key steps. Knoevenagel reaction of 2-methyl-3-phenylquinazolin-4(3H)-one proceeded smoothly under a basic condition and subsequent Friedel-Craft alkylation with BrOnsted acid gave the N-heteropolycyclic quinazolinones in good yields. Furthermore, these new polycyclic compounds were converted into organic molecules having a long -conjugation system by treatment of 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) to utilize them as organic dyes.
Visible-light-induced denitrogenative phosphorylation of benzotriazinones: a metal- and additive-free method for accessing <i>ortho</i>-phosphorylated benzamide derivatives
3-benzotriazinones was achieved. With the use of eosin Y as a photoredox catalyst, N,N-diisopropylethylamine as a base, CH3CN–H2O as a solvent and sunlight or a blue LED as a light source, a variety of aryl-phosphonates, aryl-phosphinates, and aryl-phosphine oxides were efficiently prepared. In addition, B2pin2 instead of P-nucleophiles as a radical acceptor was also demonstrated. The key advantages of this
Sustainable methine sources for the synthesis of heterocycles under metal- and peroxide-free conditions
作者:Gopal Chandru Senadi、Vishal Suresh Kudale、Jeh-Jeng Wang
DOI:10.1039/c8gc03839b
日期:——
identified as sustainable methine sources for synthesizing quinazolinone and benzimidazole derivatives using a combination of TsOH·H2O/O2 and appropriate bis-nucleophiles for the first time. Deuterium labeling studies clearly proved that the C2 hydrogen of the synthesized heterocycles came from the methine source. These unique reaction conditions were successfully applied to the synthesis of echinozolinone
首次将TsOH·H 2 O / O 2和适当的双亲核试剂组合使用,将醇和醚确定为可持续的次甲基来源,用于合成喹唑啉酮和苯并咪唑衍生物。氘标记研究清楚地证明了合成杂环的C 2氢来自次甲基。这些独特的反应条件已成功地用于合成棘金龙酮(2e'),2f'(rutaecarpine和(±)evodiamine的常见前体)和二咪唑(6d)。该方法的显着特征包括低毒性,使用商业原料作为底物,成本低,对官能团的耐受性强以及对多种双亲核起始原料的适用性。
One-Pot, Multistep Reactions for the Modular Synthesis of <i>N</i>,<i>N</i>′-Diarylindazol-3-ones
作者:Shuai Liu、Liang Xu、Yu Wei
DOI:10.1021/acs.joc.8b02548
日期:2019.2.1
synthesis of N,N′-diarylindazol-3-ones has been developed using readily available isatoic anhydrides, aryl amines, and aryl boronic acids. A Cu-catalyzed oxidative C–N cross-coupling and dehydrogenative N–N formation sequence under an air atmosphere affords indazol-3-one derivatives in good to excellent yields. Such process merges well with the preceding decarboxylative amination reaction, resulting
Potassium Iodide/
<i>tert</i>
‐Butyl Hydroperoxide‐Mediated Oxidative Annulation for the Selective Synthesis of
<i>N</i>
‐Substituted 1,2,3‐Benzotriazine‐4(3
<i>H</i>
)‐ones Using Nitromethane as the Nitrogen Synthon
作者:Yizhe Yan、Bin Niu、Kun Xu、Jianhua Yu、Huanhuan Zhi、Yanqi Liu
DOI:10.1002/adsc.201500619
日期:2016.1.21
A novel and efficient oxidative annulation of 2‐aminobenzamides with nitromethane has been developed for the chemoselective synthesis of N‐substituted 1,2,3‐benzotriazine‐4(3H)‐ones in moderate to excellent yields under transition metal‐free conditions. Two NN bonds were constructed in one pot via CN cleavage of nitromethane, which was selectively employed as the nitrogen synthon. The preliminary