Identification of non-peptidic cysteine reactive fragments as inhibitors of cysteine protease rhodesain
摘要:
Rhodesain, the major cathepsin L-like cysteine protease in the protozoan Trypanosoma brucei rhodesiense, the causative agent of African sleeping sickness, is a well-validated drug target. In this work, we used a fragment-based approach to identify inhibitors of this cysteine protease, and identified inhibitors of T. brucei. To discover inhibitors active against rhodesain and T. brucei, we screened a library of covalent fragments against rhodesain and conducted preliminary SAR studies. We envision that in vitro enzymatic assays will further expand the use of the covalent tethering method, a simple fragment-based drug discovery technique to discover covalent drug leads. (C) 2015 Elsevier Ltd. All rights reserved.
来自咪唑啉-2-硫醇衍生物,不饱和或卤代酸和酯的2,3,5,6-四氢-和5,6-二氢-咪唑并[ 2,1- b ]噻唑
摘要:
证据表明,咪唑啉-2-硫醇与乙炔二羧酸及其二甲基酯的反应产物是5,6-二氢咪唑并[ 2,1- b ]噻唑-3(2 H)-one的衍生物。该咪唑啉-2-硫醇与马来酸酐,α-溴-二羧酸及其二乙酯的反应可制得该环系的其他衍生物。用2-咪唑啉-2-巯基的2-氯乙酰乙酸乙酯和4-溴乙酰乙酸乙酯得到5,6-二氢咪唑并[2,1- b ]噻唑的衍生物,并保留了乙氧基羰基。5-取代的2-硫代乙内酰脲以相似的方式反应。