Rhodium‐Catalyzed Synthesis of Multiaryl‐substituted Naphthols via a Removable Directing Group
作者:Lianhui Wang、Yunliang Yu、Mengqi Yang、Changsheng Kuai、Dingding Cai、Jinfeng Yu、Xiuling Cui
DOI:10.1002/adsc.201700726
日期:2017.11.10
Arene homologation employing internal alkynes as coupling partners and 2‐pyridyloxyl as directing group through dual C−H bond functionalization was accomplished using (pentamethylcyclopentadienyl)‐rhodium(III) chloride dimer as a pre‐catalyst. This protocol proved tolerant of synthetically valuable functional groups, and provided an expeditious access to highly congested naphthalene derivatives in
The reactions of 1-unsubstituted 2-pyridones with benzyne afforded the Diels-Alder adduct, 5, 6-benzo-2-azabarrelen-3 (2H)-ones, together with a large amount of the Michael-type adduct, 2-phenoxypyridines.
Ruthenium-Catalyzed <i>meta</i>
-C<sub>Ar</sub>
-H Bond Difluoroalkylation of 2-Phenoxypyridines
作者:Chunqi Jia、Shichong Wang、Xulu Lv、Gang Li、Lei Zhong、Lei Zou、Xiuling Cui
DOI:10.1002/ejoc.201901883
日期:2020.4.7
A ruthenium‐catalyzed meta‐selective CAr–H bond difluoroalkylation of 2‐phenoxypyridine using 2‐bromo‐2,2‐difluoroacetate has been developed, which provide a new method to synthesize 2‐(meta‐difluoroalkylphenoxy)pyridine derivatives, which are present in many pharmaceuticals and other functional compounds.
有人开发了使用2-溴-2,2-二氟乙酸的钌催化的2-苯氧基吡啶的间选择性C Ar -H键二氟烷基化反应,为合成2-(间二氟烷基苯氧基)吡啶衍生物提供了一种新方法。存在于许多药物和其他功能性化合物中。
Rhodium‐Catalyzed Enantioselective Oxidative [3+2] Annulation of Arenes and Azabicyclic Olefins through Twofold C−H Activation
作者:Ruijie Mi、Guangfan Zheng、Zisong Qi、Xingwei Li
DOI:10.1002/anie.201911086
日期:2019.12.2
mostly limited to ortho selectivity. Activation of both ortho and meta C-H bonds constitutes a particularly important strategy for annulation, but has rarely been studied in enantioselective systems. Reported herein is rhodium(III)-catalyzed asymmetric [3+2] transannulation of arenes with 7-azabenzonorbornadienes. Two distinct classes of arenes have been identified as substrates, and the coupling proceeded
The reactions of 2-pyridones with benzyne were investigated in order to gain some insight into the structure–reactivity–chemoselectivity relationship involved in the tautomeric systems. All reactions examined have resulted in the formation of Diels-Alder and Michael-type adducts. It has been shown that the Diels-Alder reactivities were well correlated with the HOMO energy levels of the 2-pyridone form and the yields of the Michael-type adduct were closely associated with the tautomeric equilibria. In summary, the chemoselectivities of 2-pyridones in the reaction with benzyne were largely affected by the tautomeric properties.