前所未有的连续 S N 2'/S N 2'' 将苯酚添加到 γ-乙烯基 MBH 碳酸酯中形成反应性二烯中间体,然后通过二聚/消除过程得到具有优异化学选择性的官能化外环己烯。当使用邻羟基查耳酮作为亲核试剂时,会发生 S N 2'/S N 2''/分子内 Diels-Alder 反应序列,选择性地产生一系列具有良好非对映选择性的药学上有趣的三环色烷衍生物。苯氧基阴离子表现出的良好亲核性和良好的离核性在S N 2'' 加成步骤中起关键作用。
The design, synthesis, in vitro biological evaluation and molecular modeling of novel benzenesulfonate derivatives bearing chalcone moieties as potent anti-microtubulin polymerization agents
Binding mode of compound6bwith microtubule (PDB code: 1SA0). (a) 2D diagram of the interaction between compound6band amino acid residues of colchicine site nearby. (b) 3D diagram of compound6binserted in microtubulin colchicine site.
Organocatalytic regioselective asymmetric Michael addition of azlactones to o-hydroxy chalcone derivatives
作者:Shao-Yun Zhang、Gui-Yu Ruan、Zhi-Cong Geng、Nai-Kai Li、Ming Lv、Yong Wang、Xing-Wang Wang
DOI:10.1039/c5ob00121h
日期:——
enantioselective Michaeladdition between azlactones and o-hydroxy chalcone derivatives is reported. Enantiomerically enriched N,O-aminals with two continuous stereogenic centers are exclusively obtained in moderate to good yields with excellent diastereoselectivities and good to excellent enantioselectivities. The experimental results show that an o-hydroxy group on the cinnamenyl motif of chalcone derivatives
Palladium-Catalyzed Cascade Reactions of 2-(Cyanomethoxy)chalcones with Arylboronic Acids: Selective Synthesis of Emissive Benzofuro[2,3-<i>c</i>]pyridines
The Pd(II)-catalyzed cascade reactions of 2-(cyanomethoxy)chalcones with arylboronic acids were demonstrated, allowing the rapid construction of benzofuro[2,3-c]pyridine skeletons with excellent selectivity. These transformations involve the domino-style formation of C-C/C-C/C-N bonds through nitrile carbopalladation, intramolecular Michael addition, cyclization, and aromatization. This chemistry allows
钯(II)催化2-(氰基甲氧基)查康酮与芳基硼酸的级联反应,可以快速构建具有优异选择性的苯并呋喃[2,3-c]吡啶骨架。这些转变涉及通过腈碳酸酯化,分子内迈克尔加成,环化和芳构化来形成CC / CC / CN键的多米诺骨风格。该化学反应使得2-(氰基甲氧基)查耳酮与噻吩-3-基硼酸反应,以中等至良好的产率提供3-芳基-1-(噻吩-3-基)苯并呋喃[2,3-c]吡啶。另外,所得产物代表了新型的发射荧光团。
Enantioselective Synthesis of Highly Substituted Chromans via the Oxa-Michael–Michael Cascade Reaction with a Bifunctional Organocatalyst
作者:Prasenjit Saha、Arnab Biswas、Nagaraju Molleti、Vinod K. Singh
DOI:10.1021/acs.joc.5b01751
日期:2015.11.6
A highly enantioselective synthesis of chiral chroman derivatives via an oxa-Michael–Michael cascade reaction has been developed using a bifunctionalthioureaorganocatalyst. The products were obtained with excellent enantioselectivities (up to >99%), good yields (up to 95%), and diastereoselectivities (up to 5:1).
Cationic-lanthanide-complex-catalyzed reaction of 2-hydroxychalcones with naphthols: Facile synthesis of 2,8-dioxabicyclo[3.3.1]nonanes
作者:Yanan Zhu、Zhigang Yao、Fan Xu
DOI:10.1016/j.tet.2018.06.038
日期:2018.8
Cationic lanthanide complexes [Ln(CH3CN)9]3+[(AlCl4)3]3–·CH3CN served as efficient catalysts for the tandem Friedel–Crafts alkylation/ketalization reaction of 2-hydroxychalcones with naphthols/substituted phenols to produce diaryl-fused 2,8-dioxabicyclo[3.3.1]nonanes in moderate to high yields. The high catalytic efficiency of the cationic lanthanide complex [Yb(CH3CN)9]3+[(AlCl4)3]3–·CH3CN compared