Nickel Catalysis Enables Hetero [2+2+1] Cycloaddition between Yne-Isothiocyanates and Isonitriles with Low Catalyst Loading
作者:Rui-Juan Liu、Peng-Fei Wang、Wen-Kui Yuan、Li-Rong Wen、Ming Li
DOI:10.1002/adsc.201601271
日期:2017.4.17
Nickel(II) can be used to catalyze the hetero [2+2+1] cycloaddition of 2‐alkynylaryl isothiocyanates and isonitriles in 2‐methyltetrahydrofuran (2‐MeTHF) to give a wide array of thieno[2,3‐b]indoles in excellent yields. The reaction is featured by employing as little as 0.3 mol% nickel(II) acetylacetonate [Ni(acac)2] under air conditions in the absence of any additives (additional reducing agents and
Palladium-Catalyzed Oxidative [2 + 2 + 1] Annulation of 1,7-Diynes with H<sub>2</sub>O: Entry to Furo[3,4-<i>c</i>]quinolin-4(5<i>H</i>)-ones
作者:Xuan-Hui Ouyang、Fang-Lin Tan、Ren-Jie Song、Wei Deng、Jin-Heng Li
DOI:10.1021/acs.orglett.8b02883
日期:2018.11.2
A novel cascade annulation of 1,7-diynes with water has been developed for the synthesis of furo[3,4-c]quinolin-4(5H)-one skeletons with high atom- and step-economy. The transformation was enabled by a palladium catalyst in the presence of copper salt as the promoter, involving the formation of one C–C bond and two C–O bonds. Moreover, the reaction exhibits good tolerance of functional groups and broad
已经开发了一种新型的1,7-二炔用水级联反应,用于合成呋喃[3,4- c ]喹啉-4(5 H)-具有高原子经济性和阶梯经济性的骨架。在铜盐作为促进剂的情况下,钯催化剂可实现转化,包括一个C–C键和两个C–O键的形成。此外,该反应显示出对官能团的良好耐受性和广泛的底物范围。值得注意的是,对照实验支持从水中引入新的氧原子。
Photocatalyzed Intramolecular [2+2] Cycloaddition of
<i>N</i>
‐Alkyl‐
<i>N‐(</i>
2‐(1‐arylvinyl)aryl)cinnamamides
作者:Wanderson C. Souza、Bianca T. Matsuo、Priscilla M. Matos、José Tiago M. Correia、Marilia S. Santos、Burkhard König、Marcio W. Paixão
DOI:10.1002/chem.202003641
日期:2021.2.19
N‐Alkyl‐N‐(2‐(1‐arylvinyl)aryl)cinnamamides are converted into natural product inspired scaffolds via iridium photocatalyzed intramolecular [2+2] photocycloaddition. The protocol has a broad substrate scope, whilst operating under mild reaction conditions. Tethering four components forming a trisubstituted cyclobutane core builds rapidly high molecular complexity. Our approach allows the design and
N-烷基-N-( 2-(1-芳基乙烯基)芳基)肉桂酰胺通过铱光催化的分子内[2 + 2]光环加成反应转变为天然产物。该协议具有广泛的底物范围,同时在温和的反应条件下运行。束缚形成三取代的环丁烷核心的四个成分会迅速建立高分子复杂性。我们的方法允许设计和合成多种四氢环丁酮[ c ]喹啉-3(1 H)-酮,产率在20–99%之间,并且具有出色的区域选择性和非对映选择性。此外,已证明在环丁烷环断裂后,1,7-烯炔的分子内[2 + 2]-环加成反应会导致类似烯炔的复分解。
Synthesis of binuclear iridium(III) and rhodium(III) complexes bearing methylnaphthalene-linked N-heterocyclic carbenes, and application to intramolecular hydroamination
with silver oxide followed by [Cp∗MCl2]2 (M = Ir, Rh), binuclear iridium and rhodiumcomplexes 2 were formed. Reaction of these complexes 2 with AgPF6 afforded Cl-bridged cationic binuclear iridium and rhodiumcomplexes 3. X-ray crystallographic analysis of 3 revealed that the two imidazole rings of the carbene ligand are in a parallel geometry. The cationic binuclear iridiumcomplexes 3-Ir could be
3-Sulfenylindoles can be efficiently prepared in moderate to good yields from 2-(1-alkynyl)benzenamines and disulfides using the palladium/air catalytic systems. The study also provides a useful route to the synthesis of fipronil analogues.