Total synthesis of structures proposed for quinocitrinines A and B and their analogs. Microwave energy as efficient tool for generating heterocycles
作者:Victoria Machtey、Hugo E. Gottlieb、Gerardo Byk
DOI:10.3998/ark.5550190.0012.923
日期:——
A first totalsynthesis of the structuresproposed for quinocitrinines A and B has been accomplished by a three steps strategy which also applies for the synthesis of non-natural analogs. In the first step a microwave assisted Friedlander condensation between a substituted oamino-benzaldehyde and a substituted tetramic acid generated intermediate fused tricyclic quinolines which were N-methylated using
为奎尼奇宁 A 和 B 提出的结构的第一次全合成已通过三步策略完成,该策略也适用于非天然类似物的合成。在第一步中,取代的邻氨基苯甲醛和取代的特拉姆酸之间的微波辅助弗里德兰德缩合生成中间体稠合三环喹啉,其使用三氟甲磺酸甲酯进行 N-甲基化。天然化合物是在使用 BBr3 从芳环上裂解 O-甲基后获得的。所有反应都受到内酰胺环中 C-11 的差向异构化的影响,将奎尼替林 A 转化为奎尼奇宁 B。为了减少差向异构化,优化分析是必要的。
Expanding the Scope of Oligo-pyrrolinone–Pyrrolidines as Protein–Protein Interface Mimics
作者:Arjun Raghuraman、Dongyue Xin、Lisa M. Perez、Kevin Burgess
DOI:10.1021/jo400323k
日期:2013.5.17
Oligo-pyrrolinone-pyrrolidines (generic structure 1) have the potential to interfere with protein-protein interactions (PPIs), but to reduce this to practice it is necessary to be able to synthesize these structures with a variety of different side chains corresponding to genetically encoded proteins. This paper describes expansion of the synthetic scope of 1, the difficulties encountered in this process, particularly issues with epimerization and slow coupling rates, and methods to overcome them. Finally, spectroscopic and physicochemical properties as well as proteolytic stabilities of molecules in this series were measured; these data highlight the suitability of oligo-pyrrolinone-pyrrolidines for the development of pharmacological probes or pharmaceutical leads.
A general approach for the synthesis of 5-substituted-4-amino-pyrrolidin-2-ones and 5-substituted-4-amino-3-pyrrolin-2-ones
作者:Sergio Pinheiro、Ronaldo C. da Silva Júnior、Acácio Silva de Souza、José Walkimar de M. Carneiro、Estela M.F. Muri、O.A.C. Antunes
DOI:10.1016/j.tetlet.2009.03.003
日期:2009.5
Short stereoselective syntheses of both 5-substituted-4-amino-pyrrolidin-2-ones and 5-substituted-4-amino-3-pyrrolin-2-ones from natural alpha-amino acids are described. (C) 2009 Elsevier Ltd. All rights reserved.