InBr<sub>3</sub>-Promoted Divergent Approach to Polysubstituted Indoles and Quinolines from 2-Ethynylanilines: Switch from an Intramolecular Cyclization to an Intermolecular Dimerization by a Type of Terminal Substituent Group
Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively
Revisiting the Gold-Catalyzed Dimerization of 2-Ethynylanilines: A Room-Temperature and Silver-Free Protocol for the Synthesis of Multifunctional Quinolines
作者:Chandrasekar Praveen、P. Perumal
DOI:10.1055/s-0035-1561305
日期:——
heterocyles also as exemplified by the preparation of naphthyridines. Competition reactions to determine the reactivity of dissimilar alkynes demonstrated that the product ratio of dimerization vsintermolecular addition is rather dependent on the electronic nature of aryl substituent on the alkynes. However, control experiments with substrates possessing internal alkynes resulted in cycloisomerization
Diversity-oriented synthesis of pyrazolo[4,3-b]indoles by gold-catalysed three-component annulation: application to the development of a new class of CK2 inhibitors
efficiently prepared from simple starting materials using a gold-catalysed three-component annulation reaction as a key step. Several of the newly synthesized compounds displayed high levels of inhibitory activity, indicating that the pyrazolo[4,3-b]indole core represents a promising scaffold for the development of potent CK2 inhibitors.
基于对先前报道的苯基吡唑型CK2抑制剂的结合模式分析,将吡唑并[4,3- b ]吲哚衍生物设计为新型CK2抑制剂化合物。一系列吡唑并[4,3-的b ]吲哚和相关二氢[4,3- b ]吲哚进行有效地从使用金催化的三组分环反应作为关键步骤简单的起始原料制备。一些新合成的化合物显示出高水平的抑制活性,表明吡唑并[4,3- b ]吲哚核代表了有效的CK2抑制剂开发的有希望的支架。
Design and synthesis of mycobacterial pks13 inhibitors: Conformationally rigid tetracyclic molecules
tuberculosis (Mtb), resulting in superior anti-tuberculosis (TB) activity. Compared to the corresponding ‘open-form’ ethyl benzofuran-3-carboxylates, the enhanced anti-TB effects seen with the conformationally restricted coumestan series could be attributed to the extra π-π stacking interactions between the benzene ring of coumestans and the phenyl ring of F1670 residue located in the Pks13-TE binding
我们之前报道了一系列香豆素——一种含有δ-内酯的天然四环支架——可有效靶向结核分枝杆菌( Mtb )中聚酮合酶 13 (Pks13) 的硫酯酶结构域,从而产生优异的抗结核 (TB) 活性。与相应的“开放式”苯并呋喃-3-羧酸乙酯相比,构象受限的香豆素系列增强的抗结核作用可归因于香豆素的苯环和苯环之间额外的 π-π 堆积相互作用位于 Pks13-TE 结合域的 F1670 残基。为了进一步探索这种结合特征,合成了新的四环类似物并评估了它们对Mtb的抗结核活性菌株 H 37 Rv。“开放形式”类似物与四环对应物的初步比较再次表明后者在抗结核活性方面更胜一筹。特别是含有 δ-内酰胺的 5 H - benzofuro [3,2 - c ]quinolin-6-ones 给出了最有希望的结果。化合物65显示出对Mtb H 37 Rv 的有效活性,MIC 值介于 0.0313 和 0.0625 μg/mL