Cycloruthenated Complexes from Imine-Based Heterocycles: Synthesis, Characterization, and Reactivity toward Alkynes
作者:Luciano Cuesta、Tatiana Soler、Esteban P. Urriolabeitia
DOI:10.1002/chem.201201382
日期:2012.11.19
complexes. These ruthenacycles react with 3‐hexyne through an unexpected pathway, which involves the coupling of the original imino heterocycle and acetylene followed by dearomatization to afford fused hetero‐hydropyridyl ligands bonded to the Ru(p‐cymene)} organometallic moiety (i.e., 7 a–c and 8 a–c). These complexes represent, as far as we know, the first examples of this type of compound within the
of asymmetric carbonyl catalysis via a chiral Lewis acid-bonded aldehyde has been developed for the direct Mannich/condensation cascade reaction of glycine ester with aromatic aldimines. The co-catalytic system of 2-picolinaldehyde and chiral YbIII-N,N′-dioxides was identified to be efficient under mild conditions, providing a series of trisubstituted imidazolidines in moderate to good yields with high
开发了一种通过手性路易斯酸键醛进行不对称羰基催化的新策略,用于甘氨酸酯与芳香醛亚胺的直接曼尼希/缩合级联反应。 2-吡啶甲醛和手性 Yb III - N , N '-二氧化物的共催化体系被认为在温和条件下是有效的,以中等至良好的收率提供了一系列三取代咪唑烷,具有高非对映和对映选择性。通过改变手性配体的子结构实现对映异构合成。该反应可以以涉及甘氨酸酯、醛和苯胺的三组分形式进行,并且具有同样良好的结果。基于控制实验、X射线晶体结构研究和理论计算,提供了一种可能的双激活机制和立体控制模式,以阐明羰基催化和对映体发散。
β-Amino nitriles are important molecular scaffolds. Cyanoalkylation of imines is the most straightforward method for the construction of these scaffolds. In this study, we report the novel cyanoalkylation of imines via radical coupling enabled by a photoactive electrondonor–acceptorcomplex. This strategy is characterized by mild conditions, broad reaction scopes, and high atom economy. The scalability
β-氨基腈是重要的分子支架。亚胺的氰烷基化是构建这些支架的最直接的方法。在这项研究中,我们报道了通过光敏电子供体-受体复合物实现的自由基偶联实现亚胺的新型氰烷基化。该策略具有条件温和、反应范围广、原子经济性高等特点。该策略的可扩展性和实用性通过 40 g 连续流动系统得到了证明,从中获得了多种重要的药物相关分子。
Novel Thiophene-Based Cycloruthenated Compounds: Synthesis, Characterization, and Reactivity
作者:Luciano Cuesta、Irene Maluenda、Tatiana Soler、Rafael Navarro、Esteban P. Urriolabeitia
DOI:10.1021/ic101946n
日期:2011.1.3
ruthenacycles of stoichiometry [Ru(C∧N)(NCMe)4]PF6 (C∧N = orthometalated thiopheneimine). In these species, the C−H activation process is produced in most cases at the thiophene ring. When two C−H bonds are competing (thiophene vs aryl), the cyclometalation can be driven regioselectively to the thiophene unit or to the aryl ring as a function of the location of the iminic C═N bond. Cyclometalation can also
一系列之间的反应噻吩基与[(η亚胺6 -C 6 H ^ 6)的RuCl(μ-Cl)的] 2,在碱性介质中,并在MeCN给家庭化学计量的[Ru(C的ruthenacycles的∧ N)(NCMe)4 ] PF 6(C ∧N =正金属化的噻吩亚胺)。在这些物种中,CH活化过程在大多数情况下是在噻吩环上产生的。当两个CH键竞争时(噻吩与芳基),环金属化可以根据亚甲基C═N键的位置被区域选择性地驱动到噻吩单元或芳环上。根据杂环中亚胺的情况(分别为3或2),环金属化也可以定向到噻吩的2或3位。在所有研究的情况下,η 6 -C 6 H ^ 6配体被乙腈取代。已经确定了两种代表性复合物的X射线结构。这些基于噻吩的金属环在非常温和的条件下与碘反应,水解后得到取代的3-碘-2-甲酰基(苯并)噻吩或取代的2-碘-3-甲酰基(苯并)噻吩,作为有机金属前体的函数。
Enantioselective Construction of C3-Multifunctionalization α-Hydroxy-β-amino Pyridines via α-Pyridyl Diazoacetate, Water, and Imines for Drug Hunting
作者:Jian Xue、Zhengli Luo、Jisheng Huang、Yaqi Deng、Suzhen Dong、Shunying Liu
DOI:10.1021/acs.orglett.2c03987
日期:2022.12.30
An asymmetric catalytic approach for the construction of C3-multifunctionalization α-hydroxy-β-amino pyridines has been reported. The products can be accessed by the modulation of two chiral catalysts independently in high yield and with good enantioselectivity. The method features mild reaction conditions and an excellent functional group tolerance. Biological activity analysis shows that the resulting products have a selective antiosteosarcoma activity on 143B cells.