C−H Bond Functionalization in the Synthesis of Fused 1,2,3-Triazoles
摘要:
A highly modular approach to fused 1,2,3-triazoles has been developed featuring a one-pot procedure combining copper(I) catalyzed azide-alkyne cycloaddition and palladium-catalyzed C-H bond functionalization. A class of structurally unique heterocycles was synthesized in good yields.
Metal-free synthesis of 2-aminonaphthalenes by intramolecular transannulation of 1-sulfonyl-4-(2-alkenylphenyl)-1,2,3-triazoles
作者:Ze-Feng Xu、Xing Yu、Dongdong Yang、Chuan-Ying Li
DOI:10.1039/c7ob00637c
日期:——
A facile metal-free synthesis of 2-aminonaphthalenes by intramolecular transannulation of 1-sulfonyl-4-(2-alkenylphenyl)-1,2,3-triazoles was realized with the proposed ketenimine as the key intermediate.
作者:Vladimir Akhmetov、Mikhail Feofanov、Dmitry I. Sharapa、Konstantin Amsharov
DOI:10.1021/jacs.1c07845
日期:2021.9.22
alkynes is the key feature of carbophilic π-Lewis acids such as gold- and platinum-based catalysts. The unique catalytic activity of these compounds in electrophilic activations of alkynes is explained through relativistic effects, enabling efficient orbital overlapping with π-systems. For this reason, it is believed that noble metals are indispensable components in the catalysis of such reactions. In this
Palladium-Catalyzed Synthesis of Tetrasubstituted Olefins by Triple Domino Process
作者:Kanagaraj Naveen、Savariyappan Albert Nikson、Paramasivan Thirumalai Perumal
DOI:10.1002/adsc.201700169
日期:2017.7.17
An efficient, highly regio‐ and stereoselective protocol for the synthesis of tetrasubstituted olefins was developed to take place by a palladium(0)‐catalyzed triple domino process. It involves the formation of three new C−C bonds through double carbopalladation and C−H activation across 2‐bromoaryl alkynyl biaryls/heteroaryls with norbornene. This method is practically simple with broad substrate
通过钯(0)催化的三重多米诺工艺开发了一种高效,高度区域选择性和立体选择性的合成四取代烯烃的方案。它涉及通过双碳钯和通过2-降冰片芳基炔基联芳基/杂芳基与降冰片烯的双碳键合和CH活化形成三个新的CC键。该方法实际上很简单,具有广泛的底物范围,并且可以耐受各种取代基。带有9 H-吡咯并[1,2- a ]吲哚基序的产物显示出令人感兴趣的固态荧光特性,因此形成了一类新的聚集诱导发射(AIE)荧光团。
Bis(cyclopropenium)phosphines: Synthesis, Reactivity, and Applications
作者:Gerlinde Mehler、Pawel Linowski、Javier Carreras、Alessandro Zanardi、Jonathan W. Dube、Manuel Alcarazo
DOI:10.1002/chem.201601759
日期:2016.10.17
substituent pattern on the catalytic activity of the metalcomplexes thereof derived is also studied. Whereas sterically demanding biarylgroups directly attached to the phosphorus atom seem to facilitate elementary steps such as the product release from the catalyst, longchain dialkylamino groups on the cyclopropenium units maximize the catalysts solubility and, thus, allow the use of typical apolar
Visible-Light-Photocatalyzed Metal-Free C-H Heteroarylation of Heteroarenes at Room Temperature: A Sustainable Synthesis of Biheteroaryls
作者:Pintu Maity、Debasish Kundu、Brindaban C. Ranu
DOI:10.1002/ejoc.201500006
日期:2015.3
An efficient C–Hheteroarylation of heteroarenes is achieved through visible-light photoredox-catalyzed diazotization of heteroarylamines in situ by tBuONO at roomtemperature. A library of functionalized biheteroaryls is obtained by using this protocol. The reaction avoids the use of transition-metal catalysts, additives, and acidic reaction medium.