Structure–activity relationships of 2-aminothiazoles effective against Mycobacterium tuberculosis
摘要:
A series of 2-aminothiazoles was synthesized based on a HTS scaffold from a whole-cell screen against Mycobacterium tuberculosis (Mtb). The SAR shows the central thiazole moiety and the 2-pyridyl moiety at C-4 of the thiazole are intolerant to modification. However, the N-2 position of the aminothiazole exhibits high flexibility and we successfully improved the antitubercular activity of the initial hit by more than 128-fold through introduction of substituted benzoyl groups at this position. N-(3-Chlorobenzoyl)-4-(2-pyridinyl)-1,3-thiazol-2-amine (55) emerged as one of the most promising analogues with a MIC of 0.024 mu M or 0.008 mu g/mL in 7H9 media and therapeutic index of nearly similar to 300. However, 55 is rapidly metabolized by human liver microsomes (t(1/2) = 28 min) with metabolism occurring at the invariant aminothiazole moiety and Mtb develops spontaneous low-level resistance with a frequency of similar to 10 (5). (C) 2013 Elsevier Ltd. All rights reserved.
A Novel and Efficient One Pot Synthesis of 2,4-Disubstituted Thiazoles and Oxazoles Using Phenyltrimethylammoniumtribromide in Ionic Liquid
作者:Manoj Kumar Muthyala、Anil Kumar
DOI:10.1002/jhet.904
日期:2012.7
A novel and efficient one‐pot procedure has been described for synthesis of 2,4‐disubstituted thiazoles and oxazoles from substituted ketones using phenyltrimethylammoniumtribromide as in situ brominating agent followed by reaction with thioamide/thiourea and amides/ureas, respectively in [bmim][BF4] ionicliquid. The advantages of the procedure include avoiding the handling of lacrymetric compounds
A novel and facile metal-free method for the green synthesis of 2-amino-4-arylthiazole derivatives through the three-component cascade reaction of aromatic methyl ketones, elemental sulfur and cyanamide is reported. One CN bond and two CS bonds were formed in one-pot protocol without using catalysts.
报道了一种通过芳族甲基酮、元素硫和氰胺的三组分级联反应绿色合成 2-氨基-4-芳基噻唑衍生物的新型、简便的无金属方法。在不使用催化剂的情况下,在一锅法中形成一个 C N 键和两个 C S 键。
Structure–activity relationships of 2-aminothiazoles effective against Mycobacterium tuberculosis
作者:Anja Meissner、Helena I. Boshoff、Mahalakshmi Vasan、Benjamin P. Duckworth、Clifton E. Barry、Courtney C. Aldrich
DOI:10.1016/j.bmc.2013.08.048
日期:2013.11
A series of 2-aminothiazoles was synthesized based on a HTS scaffold from a whole-cell screen against Mycobacterium tuberculosis (Mtb). The SAR shows the central thiazole moiety and the 2-pyridyl moiety at C-4 of the thiazole are intolerant to modification. However, the N-2 position of the aminothiazole exhibits high flexibility and we successfully improved the antitubercular activity of the initial hit by more than 128-fold through introduction of substituted benzoyl groups at this position. N-(3-Chlorobenzoyl)-4-(2-pyridinyl)-1,3-thiazol-2-amine (55) emerged as one of the most promising analogues with a MIC of 0.024 mu M or 0.008 mu g/mL in 7H9 media and therapeutic index of nearly similar to 300. However, 55 is rapidly metabolized by human liver microsomes (t(1/2) = 28 min) with metabolism occurring at the invariant aminothiazole moiety and Mtb develops spontaneous low-level resistance with a frequency of similar to 10 (5). (C) 2013 Elsevier Ltd. All rights reserved.
Über die Kondensationsfähigkeit der 2-ständigen Methylgruppe in Thiazolverbindungen
1. DieKondensationsfähigkeit von 2-Methylthiazolverbindungen gegenüber Benzaldehyd wurde an zahlreichen Beispielen, so auch am 2-Methylthiazol, nachgeprüft und die Struktur der so erhaltenen 2-Styrylthiazolverbindungen durch direkte Synthese aus Zimtsäurethioamid und Halogencarbonylverbindungen belegt.