Cascade Reactions Assisted by Microwave Irradiation: Ultrafast Construction of 2-Quinolinone-Fused γ-Lactones from <i>N</i>-(<i>o</i>-Ethynylaryl)acrylamides and Formamide
作者:Bruce A. L. Sacchelli、Bianca C. Rocha、Leandro H. Andrade
DOI:10.1021/acs.orglett.1c01606
日期:2021.7.2
methodology to construct novel highly functionalized 2-quinolinones from N-(o-ethynylaryl)acrylamides (1,7-enynes) is described for the first time. Microwave irradiation enabled the ultrafast synthesis of 2-quinolinone-fused γ-lactones from Fenton’s reagents in formamide. After six key consecutive reactions, including a diastereoselective step, 2-quinolinone-fused γ-lactones were obtained in good overall
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.
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
Sulfur Incorporation Using Disulfanes as the Sulfur Atom Source Enabled Metal‐Free Heteroannulation of 1,7‐Enynes
作者:Jing‐Hao Qin、Jiang‐Xi Yu、Jin‐Heng Li、De‐Lie An
DOI:10.1002/adsc.201900621
日期:2019.9.3
A new oxidative [2+2+1] heteroannulation of 1,7‐enynes with disulfanes promoted by Et3N, producing 3,3a‐dihydro‐thieno[3,4‐c]quinolin‐4(5H)‐ones, is described. This reaction is achieved by using equivalent amounts of 1,7‐enynes, sulfur atoms (disulfanes), tert‐butyl peroxybenzoate (TBPB) as an oxidant and Et3N as the base, and represents an unprecedented strategy to applications of disulfanes as sulfur
Metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates toward thieno[3,4-<i>c</i>]quinolin-4(5<i>H</i>)-ones
作者:Jiang-Xi Yu、Shijie Niu、Ming Hu、Jian-Nan Xiang、Jin-Heng Li
DOI:10.1039/c9cc02242b
日期:——
metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates for producing thieno[3,4-c]quinolin-4(5H)-ones is presented. This reaction employs benzoylperoxide (BPO) as the oxidant and sodium thiocyanate as the sulfur source to enable the formation of three chemical bonds, two C–S bonds and one C–C bond, in a single reaction, and represents a new, practical access to S-heterocycles with
提出了一种新的无金属的1,7-烯炔与硫氰酸盐的氧化性[2 + 2 + 1]杂环化反应,用于生产噻吩并[3,4- c ]喹啉-4(5 H)-酮。该反应采用过氧化苯甲酰(BPO)作为氧化剂,硫氰酸钠作为硫源,可在一次反应中形成三个化学键,两个CS键和一个CC键,代表了一种新的实用途径避免使用金属催化剂和过量的碱。