Discovery of trypanocidal thiosemicarbazone inhibitors of rhodesain and TbcatB
摘要:
Human African trypanosomiasis ( HAT) is caused by the protozoan parasite Trypanosoma brucei. The cysteine proteases of T. brucei have been shown to be crucial for parasite replication and represent an attractive point for therapeutic intervention. Herein we describe the synthesis of a series of thiosemicarbazones and their activity against the trypanosomal cathepsins TbcatB and rhodesain, as well as human cathepsins L and B. The activity of these compounds was determined against cultured T. brucei, and specificity was assessed with a panel of four mammalian cell lines. (c) 2008 Elsevier Ltd. All rights reserved.
Directing Group‐Free Formal Suzuki–Miyaura Coupling of Simple Ketones Enabled by Activation of Unstrained C−C Bonds
作者:Jiangkun Huang、Xufei Yan、Ying Xia
DOI:10.1002/anie.202211080
日期:2022.12.5
A Rh-catalyzed directing group-free formal Suzuki–Miyauracouplingreaction was established between simple ketones and arylboronates based on activation of unstrained C−C bonds. The key to the success of this reaction is a nucleophilic addition/β-carbon elimination sequence that can activate the unstrained ketone carbonyl C−C bond without the assistance of directinggroup.