Copper-Catalyzed Radical [2 + 2 + 1] Annulation of Benzene-Linked 1,n-Enynes with Azide: Fused Pyrroline Compounds
摘要:
A novel selective copper-catalyzed radical [2 + 2 + 1] annulation of benzene-linked 1,n-enynes with azido-benziodoxolone to access fused pyrroline compounds, including 3H-pyrrolo[3,4-c]quinolin-4(3aH)-ones, chromeno[3,4-c]pyrrol-4(9bH)-one, and indeno[1,2-c]pyrroline, has been developed, which proceeds via the addition of the azide radical to the alkene, annualtion, and azidation cascade.
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
Cascade Nitration/Cyclization of 1,7-Enynes with<i>t</i>BuONO and H<sub>2</sub>O: One-Pot Self-Assembly of Pyrrolo[4,3,2-<i>de</i>]quinolinones
作者:Yu Liu、Jia-Ling Zhang、Ren-Jie Song、Peng-Cheng Qian、Jin-Heng Li
DOI:10.1002/anie.201404192
日期:2014.8.18
Here we describe the one‐pot construction of the pyrrolo[4,3,2‐de]quinolinone scaffold by a cascadenitration/cyclization sequence of 1,7‐enynes with tBuONO and H2O. The cascade proceeds through alkene nitration, 1,7‐enyne 6‐exo‐trig cyclization, CH nitrations, and redox cyclization, and exhibits excellent functional group tolerance. The mechanism was investigated using in situ high‐resolution mass
Palladium-catalyzed dearomatizative [2 + 2 + 1] carboannulation of 1,7-enynes with aryl diazonium salts and H<sub>2</sub>O: facile synthesis of spirocyclohexadienone-fused cyclopenta[c]quinolin-4(5H)-ones
作者:Yu Liu、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c7cc02830j
日期:——
A new palladium-catalyzed dearomatizative [2 + 2 + 1] carboannulation of 1,7-enynes with aryl diazoniumsalts and H2O is presented. The reaction enables the construction of spirocyclohexadienone-fused cyclopenta[c]quinolin-4(5H)-ones through a sequence of Heck-type addition, 6-exo-dig cyclization, ipso-cyclization, dearomatization and hydrolysis.
Oxidative radical divergent Si-incorporation: facile access to Si-containing heterocycles
作者:Yuan Yang、Ren-Jie Song、Yang Li、Xuan-Hui Ouyang、Jin-Heng Li、De-Liang He
DOI:10.1039/c7cc08964c
日期:——
which allows selective activation of dual chemical bonds around the Si-atom center relying on the nature of alkylsilanes. While for tertiary silanes selective functionalization of Si–H/silyl C(sp3)–H bonds in intermolecular oxidative annulation cascades with N-(2-(ethynyl)aryl)acrylamides toward silino[3,4-c]quinolin-5(3H)-ones, when using secondary silanes and HSi(TMS)3, dual Si–H bonds or Si–H/Si–Si
描述了避免使用昂贵的贵金属/配体催化体系的铜催化的氧化自由基策略,其允许依赖于烷基硅烷的性质选择性活化围绕硅原子中心的双化学键。而对于叔硅烷而言,在分子间氧化环氧化级联反应中,Si-H /甲硅烷基C(sp 3)-H键与N-(2-(乙炔基)芳基)丙烯酰胺对硅烷[3,4- c ] quinolin-5( 3 H)-ones,当使用仲硅烷和HSi(TMS)3时,双Si–H键或Si–H / Si–Si键被选择性裂解,形成4 H -silolo [3,4- c ] quinolin-4 -那些。
Copper-Catalyzed C–H Oxidative Radical Functionalization and Annulation of Aniline-Linked 1,7-Enynes: Evidence for a 1,5-Hydride Shift Mechanism
作者:Ming Hu、Hua-Xu Zou、Ren-Jie Song、Jian-Nan Xiang、Jin-Heng Li
DOI:10.1021/acs.orglett.6b03352
日期:2016.12.16
A new copper-catalyzed tandem C–H oxidative radical functionalization and annulation of aniline-linked 1,7-enynes with alkyl nitriles or acetone is described. This reaction allows the selective construction of 1H-cyclopenta[c]quinolines and benzo[j]phenanthridin-6(5H)-ones which rely on the substitution effect at the 2-position of the acrylamide moiety. The mechanism involving a 1,5-hydride shift process
描述了一种新的铜催化串联C–H氧化自由基官能化和苯胺连接的1,7-烯炔与烷基腈或丙酮的环化反应。该反应允许选择性地构建1 H-环戊基[ c ]喹啉和苯并[ j ]菲咯啉-6(5 H)-,它们依赖于丙烯酰胺部分2-位的取代作用。根据控制氘标记的实验,提出了涉及1,5-氢化物转移过程的机理。