Rh(
<scp>III</scp>
)‐Catalyzed Diverse C—H Functionalization of Iminopyridinium Ylides
作者:Zhenzhen Dong、Pengfei Li、Xingwei Li、Bingxian Liu
DOI:10.1002/cjoc.202100203
日期:2021.9
Divergent synthesis of useful skeletons has been realized via rhodium(III)-catalyzed C—H activation of iminopyridinium ylides and coupling with various unsaturated coupling reagents. Isocoumarins and isoquinolones were obtained via cleavage of the C—N or N—N bond in the ylidic directing group, while fluorinated alkenes were delivered with the directing group intact. The reactions occurred with wide
1-Aminopyridinium Ylides as Monodentate Directing Groups for sp<sup>3</sup> C–H Bond Functionalization
作者:Ky Khac Anh Le、Hanh Nguyen、Olafs Daugulis
DOI:10.1021/jacs.9b06643
日期:2019.9.18
1-Aminopyridinium ylides are efficientdirecting groups for palladium-catalyzed β-arylation and alkylation of sp3 C-H bonds in carboxylic acid derivatives. The efficiency of these directing groups depends on the substitution at the pyridine moiety. The unsubstituted pyridine-derived ylides allow functionalization of primary C-H bonds, while methylene groups are unreactive in the absence of external
Visible‐Light‐Promoted Radical Cyclization and N−N Bond Cleavage Relay of N‐Aminopyridinium Ylides for Access to 2,3‐Difunctionalized Indoles
作者:Meng‐Meng Xu、Wen‐Bin Cao、Xiao‐Ping Xu、Shun‐Jun Ji
DOI:10.1002/adsc.202200248
日期:2022.7.5
accurate difunctionalization reaction undergoes a tandem process involving a radical-mediated 1,3-dipolar cycloaddtion which generated from the single-electron oxidation of N-aminopyridinium ylides, a cleavage of the N−N bond as well as an oxidation of indoline ring. The electrophilic pyridyl and nucleophilic amino groups can be installed simultaneously into a wide range of indoles under mild and metal-free
Practical conversion of <i>gem</i>-difluorocyclopropenes for the chemodivergent assembly of fluorinated heterocyclic frameworks
作者:Dongping Pan、Fu-Xiaomin Liu、Zhongyi Zeng、Junwei Ye、Ying Cai、Shengdong Wang、Zhi Zhou、Wei Yi
DOI:10.1039/d3gc03203e
日期:——
diverse fluorinatedheterocyclic frameworks including cyclopropapyrazolopyridines, indolizines, 2-fluoro-3-aryl-3-(heteroaryl)acrylamides etc. These conversions feature ultrasonic vibration-assisted solvent-free 1,3-dipolar cycloaddition, photo-induced rearrangement and mild reduction, providing a highly efficient synthetic route for the assembly of intriguing fluorine-containing compounds with good