3-HYDRAZONE PIPERAZINYL RIFAMYCIN DERIVATIVES USEFUL AS ANTIMICROBIAL AGENTS
申请人:MACIELAG Mark J.
公开号:US20090275594A1
公开(公告)日:2009-11-05
The present invention is directed to novel 3-hydrazone piperazinyl rifamycin derivatives, pharmaceutical compositions containing them and the use of said derivatives and pharmaceutical compositions as antimicrobial agents against pathogenic microorganisms, particularly against resistant microbes.
Iterative Assembly of Nitrile Oxides and Ynamides: Synthesis of Isoxazoles and Pyrroles
作者:Changwei Chen、Sunliang Cui
DOI:10.1021/acs.joc.9b01430
日期:2019.9.20
Described is an iterative assembly of nitrile oxides and ynamides for the synthesis of isoxazoles and pyrroles. The nitrile oxides could undergo Cu(I)-free cyclization with terminal ynamides for accessing isoxazoles, which could engage in another cyclization with internal ynamides in the presence of Au(I) catalyst to deliver pyrroles, and the reaction could be carried out in a two-step, one-pot procedure