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。
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.
Catalytic diastereoselective construction of multiple contiguous quaternary carbon stereocenters via [2 + 2] cycloaddition and mechanistic insight
作者:Xi Wang、Fujie Liu、Tao Xu
DOI:10.1016/j.cclet.2022.06.047
日期:2023.3
challenging, yet important structural motifs in organic synthesis. Here, we describe a visible light induced catalytic [2 + 2] cycloaddition approach that constructed up to four CQS in a pentacyclic fused ring system diastereoselectively, from the readily accessible dienamides with pendent heteroaryls. Variously substituted dienamides have been cyclized with heteroaryls to provide a range of novel CQS-containing