Decarboxylative Oxyacyloxylation of Propiolic Acids: Construction of Alkynyl-Containing α-Acyloxy Ketones
作者:Xin Chen、Yangchun Xin、Zhi-Wei Zhao、Yu-Jian Hou、Xiang-Xiang Wang、Wen-Jin Xia、Ya-Min Li
DOI:10.1021/acs.joc.1c00669
日期:2021.6.18
Novel decarboxylative oxyacyloxylation of propiolic acids has been developed. This reaction provides an efficient access to alkynyl-containing α-acyloxy ketones from readily available starting materials and exhibits significant functional group tolerance. Furthermore, oxyacyloxylation of terminal alkynes and aliphatic propiolic acids was also developed. A possible reaction mechanism is proposed based
Synthesis of the Azocino[cd]indole Framework through Pd-Catalyzed Intramolecular Acetylene Hydroarylation
作者:Vsevolod A. Peshkov、Sofie Van Hove、Pavel A. Donets、Olga P. Pereshivko、Kristof Van Hecke、Luc Van Meervelt、Erik V. Van der Eycken
DOI:10.1002/ejoc.201001669
日期:2011.4
The regio- and stereoselective construction of the azocino[cd]indole core was achieved by applying a Pd-catalyzed intramolecular acetylene hydroarylation protocol. The applicability of a similar strategy for the synthesis of the azepino[b]indole framework is demonstrated.
Sc(OTf)<sub>3</sub>-Catalyzed Iodocyclization/Ritter-Type Amidation of <i>N</i>-Alkoxypropiolamides: A Synthetic Strategy for Isoxazol-3(2<i>H</i>)-ones
A Sc(OTf)3-catalyzed iodocyclization/Ritter-type amidation of N-alkoxypropiolamides for the synthesis of 4-iodoisoxazol-3(2H)-ones bearing an amide group has been developed. This domino protocol allows the construction of a valuable heterocycle, isoxazol-3(2H)-one, as well as the introduction of two functional groups. The reaction has a broad substrate scope and can be carried out on a large scale
已经开发了一种 Sc(OTf) 3催化的N-烷氧基丙酰胺的碘环化/Ritter 型酰胺化,用于合成带有酰胺基团的 4-iodoisoxazol-3(2 H )-ones。这种多米诺骨牌协议允许构建有价值的杂环异恶唑-3(2 H )-one,以及引入两个官能团。该反应底物范围广,可大规模进行。对照实验表明,Sc(OTf) 3作为碘环化和酰胺化步骤的双重活化剂。此外,底物中的N-烷氧基抑制了一些副反应。
Copper-Catalyzed Sequential Cyclization/Migration of Alkynyl Hydrazides for Construction of Ring-Expanded N–N Fused Pyrazolones
copper-catalyzed sequential cyclization/migration reaction of alkynyl hydrazides for the synthesis of ring-expanded N–N fused pyrazolones was developed. Control experiments indicate that the copper–ligand complex plays an essential role in the reaction. This approach features a broad scope including some functionalgroup tolerance as well as a nucleophilic addition/1,3-migration/formal 1,2-migration sequence. This
The rhodium-catalyzedcycloisomerization of ester-tethered 1,6-diynes bearing a cyclopropanol moiety produced tetralone/exocyclic diene hybrid molecules with thermodynamically unfavorable alkene geometry. The results of control experiments and density functional theory calculations suggest that the ester tether plays an important role in the efficiency of E/Z isomerization processes.