Silver(I)-Catalyzed Tandem Sigamatropic Rearrangement/1,3-H Shift/6π Aza-electrocyclization of <i>N</i>-Propargylic Hydrazones: A Mild Synthetic Route to 1,6-Dihydropyridazines
A highly efficient AgOTf catalyzed [3,3] sigmatropic rearrangement/1,3-H shift/6π aza-electrocyclization cascade reaction of N-propargylic hydrazones has been developed. This method provides a new mild synthetic route to various polysubstituted 1,6-dihydropyridazines including the 3-CF3-substituted ones with high selectivity.
Nickel-Catalyzed Asymmetric Cross-Couplings of Racemic Propargylic Halides with Arylzinc Reagents
作者:Sean W. Smith、Gregory C. Fu
DOI:10.1021/ja805165y
日期:2008.9.24
A stereoconvergent method for the catalyticasymmetric Negishi cross-coupling of racemic secondary propargylic halides with arylzincreagents has been developed. Neither family of compounds has previously been shown to be a suitable partner in such coupling processes. From a practical point of view, it is noteworthy that the catalyst components (NiCl2.glyme and pybox ligand 1) are commercially available
Catalytic Cycloisomerization of Enyne Diesters Derived From 2‐Propargyloxyarylaldehydes
作者:Manoj Kumar Saini、Shashi Kant Verma、Ashok K Basak
DOI:10.1002/adsc.202200026
日期:2022.3.15
A catalytic cycloisomerization of enyne diesters derived from 2-propargyloxyarylaldehydes is described. The cycloisomerization, catalyzed by 10 mol% In(OTf)3, provides access to 2H-chromenes bearing diethyl 2-(hetero)arylidene malonates at 3-position. This enyne metathesis-type reaction is also useful for the synthesis of thia-, aza- and quinoline analogs of the 3-substituted 2H-chromenes. DDQ mediated
Enantioconvergent and regioselective reductive coupling of propargylic esters with chlorogermanes by nickel catalysis
作者:Guan-Yu Han、Pei-Feng Su、Qiu-Quan Pan、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1038/s41929-023-01052-w
日期:——
stereoconvergent coupling of propargylic esters (for example, OBoc, OAc and OPiv) with electrophiles, demonstrating exceptional propargylic selectivity. Furthermore, this work unveils the potential for development of a catalytic method to produce enantioenriched organogermanes, a largely unexplored research area. We illustrate the broad applicability of propargylic esters as substrates, investigate the
CuI-anchored porous covalent organic frameworks for highly efficient conversion of propargylic amines with CO2 from flue gas
作者:Jikuan Qiu、Xiaoqing Qi、Keping Zhu、Yuling Zhao、Haiyan Wang、Zhiyong Li、Huiyong Wang、Yang Zhao、Jianji Wang
DOI:10.1039/d4gc00122b
日期:——
utilization of CO2 from flue gas as a C1 feedstock for the catalytic synthesis of high-valued oxazolidinones is highly important but challenging due to the low CO2 concentration and high activation barrier for CO2. Herein, we present an efficient and stable CuI-anchored porous covalent organic framework CuI@TpBD-COF for effective catalysis of the carboxylic cyclization reaction between propargylic amines and
利用烟气中的CO 2作为C1原料催化合成高价值恶唑烷酮非常重要,但由于CO 2浓度低和CO 2活化势垒高,因此具有挑战性。在此,我们提出了一种高效稳定的Cu I锚定多孔共价有机骨架Cu I @TpBD-COF,用于在温和条件下有效催化炔丙胺与CO 2之间的羧基环化反应,生成各种功能化恶唑烷酮衍生物。产率高达99%,周转频率(TOF)达到1058 h -1的历史记录,大大超过了几乎所有先前报道的金属多相催化剂。此外,当模拟烟气用作CO 2来源时,Cu I @TpBD-COF 还表现出高效的催化活性。这项工作为设计更高效、更环保的不含贵金属的催化材料以驱动理想的CO 2化学固定过程提供了新的指导。