Silver Triflate-Catalyzed or Electrophile-Mediated Tandem Reaction of<i>N′</i>-(2-Alkynylbenzylidene)hydrazides with Dimethyl Acetylenedicarboxylate
作者:Zhiyuan Chen、Qiuping Ding、Xingxin Yu、Jie Wu
DOI:10.1002/adsc.200900131
日期:2009.7
Different outcomes were generated under different conditions for the tandem reactions of N′‐(2‐alkynylbenzylidene)hydrazides with dimethyl acetylenedicarboxylate (DMAD) catalyzed by silver triflate or in the presence of electrophiles. The unexpected isoquinoline‐based azomethine ylides were obtained when the reaction was catalyzed by silver triflate or in the presence of bromine, while the fused 1
AgOTf-catalyzed tandem reaction of N′-(2-alkynylbenzylidene)hydrazide with alkyne
作者:Zhiyuan Chen、Xiaodi Yang、Jie Wu
DOI:10.1039/b904498a
日期:——
AgOTf-catalyzedtandemreactions of N'-(2-alkynylbenzylidene)hydrazides with various alkynes under mild conditions are described, which generate fused 1,2-dihydroisoquinolines in good to excellent yields.
Metal Cocatalyzed Tandem Alkynylative Cyclization Reaction of in Situ Formed<i>N</i>-Iminoisoquinolinium Ylides with Bromoalkynes via C–H Bond Activation
Silver triflate and copper(I) iodide cocatalyzed direct alkynylation and cyclization reaction of in situ formed N-iminoisoquinolinium ylides with bromoalkynes is described. The reaction proceeds efficiently through a combination of C–H activation and subsequent tandem reaction in one pot, leading to diverse H-pyrazolo[5,1-a]isoquinolines in good yields under mild reaction conditions.
描述了三氟甲磺酸银和碘化铜(I)共同催化原位形成的N-亚氨基异喹啉鎓碘化物与溴炔烃的直接炔基化和环化反应。在一个反应釜中,通过C–H活化和随后的串联反应的组合,该反应得以有效进行,从而在温和的反应条件下以高收率产生了多种H-吡唑并[5,1- a ]异喹啉。
Generation of Polyfluoroaryl‐Fused
<i>H</i>
‐Pyrazolo[5,1‐
<i>a</i>
]isoquinolines through a Reaction of
<i>N</i>
′‐(2‐Alkynylbenzylidene)hydrazide with Polyfluoroarene
作者:Ling Zhang、Qian Xiao、Shengqing Ye、Jie Wu
DOI:10.1002/asia.201200227
日期:2012.8
Polyfluoroarene reacts with N′‐(2‐alkynylbenzylidene)hydrazide catalyzed by silver triflate in the presence of cesium carbonate, leading to polyfluoroaryl‐fusedH‐pyrazolo[5,1‐a]isoquinolines in good yields.
Tandem Reactions of <i>N</i>′-(2-Alkynylbenzylidene)hydrazides with Silyl Enolates: A Facile Route to <i>H</i>-Pyrazolo[5,1-<i>a</i>]isoquinolines
作者:Xingxin Yu、Zhiyuan Chen、Xiaodi Yang、Jie Wu
DOI:10.1021/cc1000314
日期:2010.5.10
A silver triflate-catalyzed tandemreaction of N′-(2-alkynylbenzylidene)hydrazide with silyl enolate is described, which generates the unexpected H-pyrazolo[5,1-a]isoquinolines in good to excellent yields. Intramolecular cyclization, nucleophilic addition, condensation, and aromatization may be involved in the reaction process.
描述了N '-(2-炔基亚苄基)酰肼与烯丙基甲硅烷基酯的三氟甲磺酸银催化串联反应,可产生出人意料的H-吡唑并[5,1- a ]异喹啉,收率高至优异。反应过程中可能涉及分子内环化,亲核加成,缩合和芳构化。