Lewis acid-catalyzed reactions of N′-(2-alkynylbenzylidene)hydrazides with diethyl phosphite
摘要:
Lewis acid catalyst-tuned reactions of N'-(2-alkynylbenzylidene)hydrazides with diethyl phosphite are described. Isoquinolin-1-ylphosphonate is generated when copper triflate is utilized as catalyst, while 2-amino-1,2-dihydroisoquinolin-1-ylphosphonate is obtained in the presence of palladium acetate. (C) 2009 Elsevier Ltd. All rights reserved.
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
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。
Synthesis of 2-(Trifluoromethyl)-[1,2,4]triazolo[5,1-a]isoquinoline via Cycloaddition ofC,N-Cyclic Azomethine Imine with CF3CN
A [3 + 2] cycloaddition of C,N-cyclicazomethineimine with in situ-generated CF3CN for the construction of 2-(trifluoromethyl)-[1,2,4]triazolo[5,1-a]isoquinoline is reported. Remarkably, this process shows a broad substrate scope with excellent functional group tolerance, which is scalable and enables a practical route to a library of 2-(trifluoromethyl)-[1,2,4]triazolo[5,1-a]isoquinoline derivatives
C , N-环状偶氮甲碱亚胺与原位生成的 CF 3 CN 进行 [3 + 2] 环加成,用于构建 2-(三氟甲基)-[1,2,4]三唑并[5,1- a ]异喹啉:报道称。值得注意的是,该过程显示出广泛的底物范围和出色的官能团耐受性,可扩展并为构建 2-(三氟甲基)-[1,2,4]三唑并[5,1- a ]异喹啉衍生物库提供了一条实用途径中等至良好的产量。