A novel silica tungstic acid (STA) as a highly efficient catalyst has been synthesized and employed for the cyclocondensation of 1,2-phenylenediamines with orthoesters under solvent-free conditions. Catalyst loadings can be as low as 1 mol% to give high yields of the corresponding benzimidazoles at 80 °C. To make the catalyst, sodium tungstate reacted with silica chloride under refluxing n-hexane.
Microwave-Assisted Synthesis of Polysubstituted Benzimidazoles by Heterogeneous Pd-Catalyzed Oxidative C-H Activation of Tertiary Amines
作者:Lidia De Luca、Andrea Porcheddu
DOI:10.1002/ejoc.201101001
日期:2011.10
Tertiaryamines can be used in place of aldehydes and carboxylic derivatives as partners in the synthesis of benzimidazoles. Dehydrogenative amine activation under heterogeneous catalysis was developed for the direct transformation of tertiaryamines into benzimidazoles. Good yields and efficient recovery and recycling of the catalyst are some of the advantages of this new methodology, which shows
Tungstatesulfuricacid (TSA) was prepared, characterized, and applied for direct synthesis of novel and known benzimidazoles through a condensation reaction of o-phenylenediamines with orthoesters undersolvent-freeconditions. TSA was characterized by powdered X-ray diffraction (XRD), X-ray fluorescence (XRF), and FTIR spectroscopy. This novel and eco-friendly method is very cheap and has many advantages
Herein we report a first, palladium catalyzed, one-pot methodology for the synthesis of pharmacologically important benzimidazoles and benzothiazoles from readily available terminal aromatic olefins. The process involves sequential C=C/C-N bondcleavage followed by C−N/C−S bond formation.
在本文中,我们报道了一种由钯催化的单罐方法,该方法可从易于获得的末端芳族烯烃中合成具有药理学意义的重要苯并咪唑和苯并噻唑。该过程涉及顺序的C = C / CN键裂解,然后形成CN / CS键。
NOVEL BENZIMIDAZOLE DERIVATIVES, PREPARATION METHOD THEREOF AND USE THEREOF AS ANTI-CANCER AGENT COMPRISING THE SAME
申请人:BIOMETRIX TECHNOLOGY INC
公开号:US20210300959A1
公开(公告)日:2021-09-30
According to the present invention, there are provided a benzimidazole carbamate-sugar compound conjugate compound represented by the following Chemical Formula 1, a preparation method thereof, and a use thereof as an anti-cancer agent:
Wherein, R
1
, R
2
, R
3
and X are as defined in the specification and claims.