Synthesis of Bicyclic Imidazoles via [2 + 3] Cycloaddition between Nitriles and Regioselectively Generated α-Imino Gold Carbene Intermediates
摘要:
The cyclic alpha-imino gold carbene intermediate B is most likely generated in situ via regioselective nitrene transfer from an azido group to a tethered terminal alkyne in the presence of a gold catalyst and at ambient temperature. This highly electrophilic intermediate can react with a weakly nucleophilic nitrile, which is used as the reaction solvent, to deliver a bicyclic imidazole rapidly in an overall bimolecular [2 + 2 + 1] cycloaddition and in mostly serviceable yield. The competing intramolecular Huisgen reaction, although likely also catalyzed by gold, is minimized by using AuCl3 as the catalyst.
The present invention provides a compound represented by the formula (I):
or a pharmacologically acceptable salt thereof, wherein Ar
1
represents an imidazolyl group that may be substituted with a C1-6 alkyl group, or the like, Ar
2
represents a phenyl group that may be substituted with a C1-6 alkoxy group, or the like, X
1
represents a double bond or the like, and Het represents an imidazolyl group that may be substituted with a C1-6 alkyl group, or the like, which is effective as a therapeutic or prophylactic agent for a disease caused by Aβ.
The present invention provides a compound represented by the formula (I):
or a pharmacologically acceptable salt thereof, wherein Ar1 represents an imidazolyl group that may be substituted with a C1-6 alkyl group, or the like, Ar2 represents a phenyl group that may be substituted with a C1-6 alkoxy group, or the like, X1 represents a double bond or the like, and Het represents an imidazolyl group that may be substituted with a C1-6 alkyl group, or the like, which is effective as a therapeutic or prophylactic agent for a disease caused by Aβ.
TYPE III SECRETION INHIBITORS, ANALOGS AND USES THEREOF
申请人:University of Massachusetts
公开号:US20140323483A1
公开(公告)日:2014-10-30
The invention, in some aspects, relates to compounds and compositions useful for inhibiting Type III secretion systems in pathogenic bacteria, such as
Yersinia Pestis
. In some aspects, the invention relates to methods for discovering inhibitors of the Type III secretion system and uses of such inhibitors in the treatment and prevention of disease.