Studies on Acetylenic Compounds. XXII. Ring Closure. (4). New Synthesis of Thiazoles and Imidazole.
作者:Yasuo Yura
DOI:10.1248/cpb.10.376
日期:——
It was found that the compounds having the general formula RCH(X)-C≡C-R'gave thiazole derivatives by reaction with thiourea. The relationship between the structure of thiazoles and substituent groups was clarified as follows : (1) When R=R'=Ph, 2-amino-4-benzyl-5-phenylthiazole (IId) is obtained, (2) When R=alkyl, R'=H, two kinds of thiazoles are obtained ; and (3) when R=R'=alkyl, thiazole derivative is not obtained. Similarly, propargyl bromide and phenylpropargyl bromide, when reacted with ammonium dithiocarbamate, afforded 2-mercapto-4-methylthiazole (XX) and 2-mercapto-4-benzylthiazole (XXIII), respectively. Further, 2-amino-4-methylimidazole (XXV) was obtained from guanidine and propargyl bromide.
Azole derivatives as histamine H3 receptor antagonists, Part I: Thiazol-2-yl ethers
作者:M. Walter、Y. von Coburg、K. Isensee、K. Sander、X. Ligneau、J.-C. Camelin、J.-C. Schwartz、H. Stark
DOI:10.1016/j.bmcl.2010.07.098
日期:2010.10
Most human histamine H3 receptor (hH3R) antagonists follow a general structural blueprint, containing a basic moiety linked by a spacer to a substituted core element. In this investigation the acceptance of thiazol-2-yl ether moieties in the core region is proved with some ether derivatives showing hH3R binding affinities in the nanomolar concentration range. A diversity of structural motifs is used
大多数人类组胺H 3受体(h H 3 R)拮抗剂遵循一般的结构蓝图,其包含通过间隔子连接至取代的核心元素的基本部分。在该研究中,通过一些在纳摩尔浓度范围内显示出h H 3 R结合亲和力的醚衍生物证明了噻唑-2-基醚部分在核心区域的接受。多种结构基序用作取代基,以增强体外h H 3 R的结合亲和力。
One-pot three-component protocol for the synthesis of substituted 2-aminothiazoles
ABSTRACT Substituted2-aminothiazoles have been synthesized from α-nitro-epoxides, cyanamide, and sodium sulfide through a facile, three-component, and ecofriendly protocol with good to excellent yields. This reaction was achieved at room temperature without any additives. A possible mechanism has also been proposed. GRAPHICAL ABSTRACT
A novel and efficient reaction has been developed to synthesize a set of substituted 2-aminothiazoles from α-nitroepoxides and ammonium thiocyanate. This reaction could proceed smoothly at mild condition, to afford products for a wide range of substrates with good to excellent yields. A possible mechanism has also been proposed.