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。
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。
Metal-free C–H methylation and acetylation of heteroarenes with PEG-400
作者:Vishal Suresh Kudale、Jeh-Jeng Wang
DOI:10.1039/d0gc01183e
日期:——
efficient route for methylation and acetylation of aza-heteroarenes using PEG-400 under O2 and TsOH·H2O for the first time by tuning the reaction conditions using a different set of starting materials. The key features of the current protocol are oxidative C–O and C–C bond scission under metal-free conditions with good functional group tolerance, and a broad substrate scope. The potential applicability
Furan-2-carbaldehydes as C1 building blocks for the synthesis of quinazolin-4(3<i>H</i>)-ones <i>via</i> ligand-free photocatalytic C–C bond cleavage
作者:Wenjia Yu、Xianwei Zhang、Bingjie Qin、Qiyang Wang、Xuhong Ren、Xinhua He
DOI:10.1039/c8gc00079d
日期:——
efficient green C1 building blocks to synthesize bioactive quinazolin-4(3H)-ones by ligand-free photocatalytic C–C bondcleavage. Notably, protection of hydroxyl, carboxyl, amide, or secondary amino groups is not required. Mechanisticstudies suggest that conjugated N,O-tridentate copper complexes act as novel photoinitiators under visible light.
[EN] 2-(2-CHLORO-4-METHYLPHENYL)QUINAZOLINE-4(3H)-KETONE COMPOUND AND MEDICAL USE THEREOF<br/>[FR] COMPOSÉ DE 2-(2-CHLORO-4-MÉTHYLPHÉNYL)QUINAZOLINE-4(3H)-CÉTONE ET SON UTILISATION MÉDICALE<br/>[ZH] 2-(2-氯-4-甲基苯基)喹唑啉-4(3H)-酮类化合物及其医药用途
申请人:INST OF PHARMACOLOGY AND TOXICOLOGY ACADEMY OF MILITARY MEDICAL SCIENCES
The Retro-2 molecule protects cells against Shiga toxins by specifically blocking retrograde transport from early endosomes to the trans-Golgi network A SAR study has been carried out to identify more potent compounds. Cyclization and modifications of Retro-2 led to a compound with roughly 100 fold improvement of the EC50 against Shiga toxin cytotoxicity measured in a cell protein synthesis assay. We also demonstrated that only one enantiomer of the dihydroquinazolinone reported herein is bioactive.