Efficient Synthesis of Isoquinoline Derivatives via AgOTf/Cu(OTf)2-Cocatalyzed Cyclization of 2-Alkynyl Benzaldoxime
摘要:
An efficient, AgOTf and Cu(OTf)(2) multicatalytic intramolecular cycloisomerization of 2-alkynylbenzaldoxime is reported. Isoquinoline N-oxides have been found to be deoxygenated to the corresponding quinolines in good yields in dimethylformamide/dichloroethane (v/v 5:1) as solvent at 120 degrees C.
Synthesis of <i>N</i>-(Isoquinolin-1-yl)sulfonamides via Ag<sub>2</sub>O-Catalyzed Tandem Reaction of <i>ortho</i>-Alkynylbenzaldoximes with Benchtop Stabilized Ketenimines
this project, a moderately efficient approach to multisubstituted N-(isoquinolin-1-yl)sulfonamide derivatives was illustrated, utilizing ortho-alkynylbenzaldoximes and zwitterionic ketenimine salts in a tandem reaction catalyzed by silver oxide. The oxophilicity of Ag2O, along with its nature as Lewisacid, pave the way for a smooth [3 + 2] cycloaddition between isoquinoline N-oxides and ketenimine species
KMnO4-mediated direct C2-selective C−H arylation of quinoline N-oxides with aromatic hydrazines
作者:Jin-Wei Yuan、Wei-Jie Li、Yong-Mei Xiao
DOI:10.1016/j.tet.2016.11.070
日期:2017.1
An efficient protocol for the synthesis of 2-arylquinoline N-oxides has been developed via KMnO4-mediated cross-coupling reaction of quinoline N-oxides with aromatic hydrazines in moderated to good yields. The reactions proceeded efficiently over a broad range of substrates with excellent regioselectivity and functional group tolerance.
Decarboxylative cross‐coupling reactions of substituted 2‐carboxyazine N‐oxides, with a variety of (hetero)arylhalides, by bimetallic Pd0/CuI and Pd0/AgI catalysis are reported. Two possible pathways, a conventional bimetallic‐catalyzed decarboxylative arylation, as well as a protodecarboxylative/direct CH arylation sequence have been considered. These methods provide the first general decarboxylative
据报道,通过双金属Pd 0 / Cu I和Pd 0 / Ag I催化,取代的2-羧嗪N-氧化物与各种(杂)芳基卤化物发生脱羧交叉偶联反应。两种可能的途径,传统的双金属催化的芳基化脱羧,以及一个protodecarboxylative /直接ç ħ芳基化序列已被考虑。这些方法为2-羧嗪系列提供了第一个通用的脱羧芳基化方法。
Generation of 1-aroxyisoquinolines via a silver-catalyzed reaction of 2-alkynylbenzaldoxime with phenol in the presence of p -toluenesulfonyl chloride
作者:Qing Xiao、Danqing Zheng、Qiuping Ding、Jie Wu
DOI:10.1016/j.tet.2013.04.076
日期:2013.6
A silver-catalyzed reaction of 2-alkynylbenzaldoxime with phenol promoted by p-toluenesulfonyl chloride leads to 1-aroxyisoquinolines in good yields. The presence of p-toluenesulfonyl chloride as an activator is essential for the successful transformation.
Silver Triflate Catalyzed Reaction of 2-Alkynylbenzaldoxime with Phenol: A General and Facile Route to 1-Aroxyisoquinolines
作者:Zhiyong Wang、Jie Wu、Danqing Zheng
DOI:10.1055/s-0030-1260121
日期:2011.9
2-Alkynylbenzaldoxime reacts with phenol under the catalysis of silver triflate in the presence of bromo-tris-pyrrolidino-phosphonium hexafluorophosphate (PyBroP) under mild conditions, leading to the formation of 1-aroxyisoquinolines in good to excellent yields. cyclizations - isoquinoline - phosphorus ligands - phenol - silver triflate