六组基于5,6,7,8-四氢[1,2,4]三唑[4,3- a ]吡啶以及5,6,7,8-四氢[1,2,已经制备了4]三唑并[1,5- a ]吡啶核。这些化合物是非平面的双环杂环,很可能会用作铅样化合物设计的优先基序。一组结构单元,(5,6,7,8-四氢[1,2,4]三唑并[4,3 - a ]吡啶-6-基甲基)胺被证明可用作开发刺激胰高血糖素的化合物的支架样肽-1(GLP-1)的分泌,是新型抗糖尿病药物的先导。
六组基于5,6,7,8-四氢[1,2,4]三唑[4,3- a ]吡啶以及5,6,7,8-四氢[1,2,已经制备了4]三唑并[1,5- a ]吡啶核。这些化合物是非平面的双环杂环,很可能会用作铅样化合物设计的优先基序。一组结构单元,(5,6,7,8-四氢[1,2,4]三唑并[4,3 - a ]吡啶-6-基甲基)胺被证明可用作开发刺激胰高血糖素的化合物的支架样肽-1(GLP-1)的分泌,是新型抗糖尿病药物的先导。
Direct access to 1-aryl-5-amino-1,2,4-triazoles and [1,2,4]triazolo[1,5-a]pyridines by two new single-step reactions from 1,3,4-thiadiazol-2-amines
作者:Oscar Mammoliti、Evelyne M. Quinton、Kristof T.J. Loones、Anh Tho Nguyen、Johan Wouters、Guy Van Lommen
DOI:10.1016/j.tet.2012.11.101
日期:2013.2
Two new single-step reactions allowing the construction of two heterocyclic motifs are reported. Both processes involve 5-substituted 1,3,4-thiadiazol-2-amines as starting materials. Reaction with 1-fluoro-2-nitrobenzenes in presence of Hunig's base permitted the convenient synthesis of various 3-substituted 1-aryl-5-amino-1,2,4-triazoles. Reaction with 2-chloro-3-nitropyridines and 2-chloro-5-nitropyridines in similar conditions readily gave access to a number of [1,2,4]triazolo[1,5-a]pyridines. In absence of base, adducts composed by one aromatic unit and two thiadiazole units were formed. This observation and previous work by Anders and co-workers led to the suggestion of plausible mechanisms for these reactions. (C) 2012 Elsevier Ltd. All rights reserved.