nickel-catalyzed cyclization of N-(o-ethynylaryl)acrylamides for the selective synthesis of dihydrocyclobuta[c]quinolin-3-ones and benzo[b]azocin-2-ones. The two varied products could be easily obtained by tuning the reaction temperature. This reaction features easy temperature-control, high efficiency, and gram-scale synthesis.
我们在本文中描述了镍催化的N -( o -ethynylaryl) 丙烯酰胺环化反应,用于选择性合成二氢环丁[ c ]quinolin-3-ones 和 benzo [ b ]azocin-ones。通过调节反应温度可以很容易地获得两种不同的产物。该反应具有易控温、高效、克级合成等特点。
A new Ag-catalyzed oxidative bicyclization of N-tethered 1,7-enynes with alkylcarboxylic acids for forming 41 examples of polycyclic 3,4-dihydroquinolin-2(1H)-ones has been established using readily accessible K2S2O8 as an oxidant. The reaction pathway involves a silver-catalyzed decarboxylation/in situ-generated C-center radical-triggered α,β-conjugated addition/6-exo-dig cyclization/H-abstraction/5-endo-trig
使用易于获得的K 2 S 2 O 8建立了一种新的Ag催化的N-链状1,7-炔烃与烷基羧酸的Ag氧化双环化反应,以形成41个多环3,4-二氢喹啉-2(1 H)-实例。作为氧化剂。反应途径涉及银催化的脱羧/原位生成的C中心自由基触发的α,β共轭加成/ 6- exo-dig环化/ H-abstraction / 5- endo-trig环化/ SET序列,允许直接定点选择性脱羧C(sp 3)-H的功能化,朝着多个C-C键的形成和复杂螺环的快速构建。
Metal-Free Radical [2+2+1] Carbocyclization of Benzene-Linked 1,<i>n</i>-Enynes: Dual C(sp<sup>3</sup>)H Functionalization Adjacent to a Heteroatom
作者:Ming Hu、Jian-Hong Fan、Yu Liu、Xuan-Hui Ouyang、Ren-Jie Song、Jin-Heng Li
DOI:10.1002/anie.201504603
日期:2015.8.10
A new metal‐free oxidative radical [2+2+1] carbocyclization of benzene‐linked 1,n‐enynes with two C(sp3)H bonds adjacent to the same heteroatom is described. This method achieves two C(sp3)H oxidative functionalizations and an annulation, thus providing efficient and general access to a variety of fused five‐membered carbocyclic hydrocarbons.
An efficient palladium-catalyzed dearomatizing [2+2+1] carbocyclization of 1,7-enynes with iodophenols has been developed. A type of tetracyclicscaffold was built in this reaction, exhibiting a broad substrate scope with moderate to excellent yields. More importantly, this method provides a potential strategy for the synthesis of tetracyclic skeleton natural products.
Cobalt‐Catalyzed Enantioselective Hydroboration/Cyclization of 1,7‐Enynes: Asymmetric Synthesis of Chiral Quinolinones Containing Quaternary Stereogenic Centers
作者:Caizhi Wu、Jiayu Liao、Shaozhong Ge
DOI:10.1002/anie.201903377
日期:2019.6.24
An asymmetric cobalt‐catalyzed hydroboration/cyclization of 1,7‐enynes to synthesize chiral six‐membered N‐heterocyclic compounds was developed. A variety of aniline‐tethered 1,7‐enynes react with pinacolborane to afford the corresponding chiral boryl‐functionalized quinoline derivatives in high yields with high enantioselectivity. This cobalt‐catalyzed asymmetric cyclization of 1,7‐enyens provides