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.
通过随后的炔基/烯基官能团的多个C-C键形成事件,建立了氧键合的1,7-烯炔与简单的环烷烃或芳基磺酰肼的催化双环化级联反应,从而在环戊烷中提供了一系列密集官能化的四环铬2-2-烯功能组兼容的方式。在前者中,Fe催化的螺双环化涉及在温和条件下的自由基加成,6-exo-dig环化,H-抽象和5-endo-trig环化序列,从而产生新的螺融合环戊五烯[ c ] chromen-2-那些通过双重α,α -C(SP 3)-H抽象。后者启用原位氧连接的1,7-烯炔的磺酰化和去磺酰化可实现多个CC键的构建,从而导致萘并[2,3 - c ] chromen-6one的形成。
An efficient photoredox‐catalyzed halo‐trifluoromethylation reaction of 1,7‐enynes has been developed under mild conditions. This photocatalytic protocol provides an efficient and functional strategy leading to CF3− and halogen‐containing 3,4‐dihydroquinolin‐2(1H)‐ones from a wide range of 1,7‐enynes through two different radical pathways. The reaction mechanism was proposed based on the control experiments
Synthesis of Fused Pyran Derivatives via Visible-Light-Induced Cascade Cyclization of 1,7-Enynes with Acyl Chlorides
作者:Chen-Guang Li、Guo-Qiang Xu、Peng-Fei Xu
DOI:10.1021/acs.orglett.6b03684
日期:2017.2.3
A photocatalytic cascade cyclization of 1,7-enynes with acyl chlorides has been established. This method offers an operationally simple access to diverse fused pyran derivatives with a broad substrate scope in high yields from simple acyl chlorides via an acyl radical intermediate.
One-Carbon Incorporation Using Cyclobutanone Oxime Ester Enabled [2 + 2 + 1] Carboannulation of 1,7-Enynes by C–C/N–O Bond Cleavage and C–H Functionalization
作者:Jiang-Xi Yu、Fan Teng、Jian-Nan Xiang、Wei Deng、Jin-Heng Li
DOI:10.1021/acs.orglett.9b03643
日期:2019.12.6
to produce canyo-functionalized 4H-cyclopenta[c]quinolin-4-ones is disclosed. ThroughC–C/N–O bond cleavage and C–H functionalization, the process enables one-carbon incorporation using cyclobutanone oximes to achieve [2 + 2 + 1] carboannulation of 1,7-enynes, which is highlighted by allowing the formation of four new bonds with high selectivity and broad substrate scope.
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.