for the direct arylation of benzothiazole by employing oxime-derived palladacycle 1 as a catalyst was developed. The new catalyst system can be used for 2-arylations by using aryl bromides and iodides. In addition, this method is especially suitable for the intramolecular direct coupling of bromo- and iodoamides, as well aschloroamides, to achieve a rapid synthesis of benzo[c]phenanthridine alkaloids
A practical and operationally simple hydrodehalogenation of halogenated carboxylic acid derivatives using a DMSO/HCOONa·2H2O system is developed. This protocol avoids the involvement of light irradiation, electrochemical apparatus, transition metals, radical initiators, strong bases, and other additional additives. Control experiments suggest that HCOONa might function as a hydride donor in the reduction
开发了使用 DMSO/HCOONa·2H 2 O 系统对卤代羧酸衍生物进行实用且操作简单的加氢脱卤。该协议避免了光照射、电化学装置、过渡金属、自由基引发剂、强碱和其他附加添加剂的参与。对照实验表明,HCOONa 可能在通过亲核取代或加成实现加氢脱卤的还原过程中充当氢化物供体。
Copper-catalyzed direct synthesis of 3-methylene-2-arylisoindolin-1-ones with calcium carbide as a surrogate of gaseous acetylene
作者:Jianglong Wu、Yinfeng Ma、Yan Wang、Chenyu Wang、Hui Luo、Dianjun Li、Jinhui Yang
DOI:10.1039/d2gc03572c
日期:——
A novel strategy for the synthesis of 3-methylene-2-arylisoindolin-1-ones through Sonogashira cross-coupling/nucleophilic addition reactions using calcium carbide as a surrogate of gaseous acetylene, 2-bromo-N-(2-bromophenyl)benzamide substrates as starting materials, and copper as a catalyst was described. The salient features of this protocol are the use of a readily available and easy-to-handle
A phenanthridinone skeleton was derived from our previous researches on thalidomide and retinoids as a multi-template for generation of anti-viral lead compounds. Structural development studies focusing on anti-hepatitis C virus activity afforded 5-butyl-2-(1,1,1,3,3,3-hexafluoro-2-hydroxypropan-2-yl)phenanthridin-6(5H)-one (10) and 5-butylbenzo[b] phenanthridin-6(5H)-one(39), which showed EC50 values of approximately 3.7 and 3.2 mu M, respectively. (C) 2010 Elsevier Ltd. All rights reserved.