Magnetic nanoparticle-supported DABCO tribromide: a versatile nanocatalyst for the synthesis of quinazolinones and benzimidazoles and protection/deprotection of hydroxyl groups
supported on magnetic Fe3O4 nanoparticles (MNPs-DABCO tribromide) as a novel heterogeneous tribromide type compound was found to be an efficient and reusable nanocatalyst for the one-pot synthesis of 2-arylquinazolin-4(3H)-ones and 2-aryl-1H-benzo[d]imidazoles through oxidative cyclization of aldehydes with 2-aminobenzamides and 1,2-phenylenediamine, respectively. Also, MNPs-DABCO tribromide catalyzed tr
发现一种新型的非均相三溴化物类型化合物,负载在磁性Fe 3 O 4纳米颗粒上的1,4-二氮杂双环[2.2.2]辛烷三溴化物(MNPs-DABCO三溴化物)是一种高效且可重复使用的纳米催化剂,可用于一锅法合成2通过分别用2-氨基苯甲酰胺和1,2-苯二胺对醛进行氧化环化反应,制得-芳基喹唑啉-4(3 H)-ones和2-芳基-1 H-苯并[ d ]咪唑。而且,MNPs-DABCO三溴化物通过在室温下改变溶剂介质,催化了多种醇和酚的三甲基甲硅烷基化/四氢吡喃基化和甲硅烷基化/脱吡喃基化。
Synthesis of 2-substituted benzimidazoles and benzothiazoles using Ag2CO3/Celite as an efficient solid catalyst
作者:Ebrahim Soleimani、Mohammad Mehdi Khodaei、Hossein Yazdani、Parisa Saei、Javad Zavar Reza
DOI:10.1007/s13738-015-0592-1
日期:2015.7
An efficient and simple approach for the synthesis of 2-substitutedbenzimidazoles and benzothiazoles through a coupling of 1,2-phenylenediamines and 2-aminothiophenols with variety of aryl aldehydes in ethanol at 70 °C using Ag2CO3/Celite as solid catalyst is described. The procedure features short reaction time, excellent yields and simple workup.
在20°C的乙醇中,使用Ag 2 CO 3 / Celite作为固体催化剂,通过1,2-苯二胺和2-氨基苯硫酚与各种芳基醛的偶合,合成2位取代的苯并咪唑和苯并噻唑的有效而简单的方法是描述。该程序的特点是反应时间短,产率高,后处理简单。
Telomerase inhibitors and methods of their use
申请人:——
公开号:US20020120144A1
公开(公告)日:2002-08-29
Thiazolidinedione compounds, compositions, and methods of inhibiting telomerase activity in vitro and treatment of telomerase mediated conditions or diseases ex vivo and in vivo are provided. The methods, compounds and compositions of the invention may be employed alone, or in combination with other pharmacologically active agents in the treatment of conditions or diseases mediated by telomerase activity, such as in the treatment of cancer. Also disclosed are methods for assaying or screening for inhibitors of telomerase activity.
BiOCl/FeOCl/SiO<sub>2</sub> nanocomposite as an efficient novel catalyst toward the synthesis of 2-aryl-1H-benzimidazoles in mild aerobic condition
作者:Hadi Mohammadi、Changiz Karami、Mahboobeh Bahri、Marayam Mahmoudian Gilany、Mohammad Ali Taher
DOI:10.1080/24701556.2017.1284105
日期:2017.9.2
transforminfrared spectroscopy. In addition, this nanocomposite was utilized efficiently in the synthesis of 2-arylbenzimidazole derivatives, which is described by the condensation of some aldehydes and o-phenylenediamines in the presence of BiOCl/FeOCl/SiO2 nanocomposite as a novel nanocatalyst. Besides the investigated variables such as the amount of catalyst, reaction temperature, the synergistic effect of BiOCl