Pd(OAc)2-Catalyzed Macrocyclization of 1,2-Diazonaphthoquinones with Cyclic Ethers
摘要:
Pd(OAc)(2) was found to be an efficient catalyst for the macrocyclization of 1,2-diazonaphthoquinones and cyclic ethers. This transformation serves as an efficient method for the synthesis of protected 1,2-naphthalenediols.
General Enantioselective C−H Activation with Efficiently Tunable Cyclopentadienyl Ligands
作者:Zhi-Jun Jia、Christian Merten、Rajesh Gontla、Constantin G. Daniliuc、Andrey P. Antonchick、Herbert Waldmann
DOI:10.1002/anie.201611981
日期:2017.2.20
applicable chiral Cp ligand collection (JasCp ligands) with highly variable and adjustable structures. Their modular nature and their amenability to rapid structure variation enabled the efficientdiscovery of ligands for three enantioselective RhIII‐catalyzed C−H activation reactions, including one unprecedented transformation. This novel approach should enable the discovery of efficientchiral Cp ligands
Oxygen‐Linked Cyclopentadienyl Rhodium(III) Complexes‐Catalyzed Asymmetric C−H Arylation of Benzo[
<i>h</i>
]quinolines with 1‐Diazonaphthoquinones
作者:Chongqing Pan、Si‐Yong Yin、Shao‐Bo Wang、Qing Gu、Shu‐Li You
DOI:10.1002/anie.202103638
日期:2021.7.5
functionalization reactions have witnessed a significant progress in organic synthesis. In sharp contrast, the reported chiral Cp ligands are limited to C-linked Cp and are often synthetically challenging. To address these issues, we have developed a novel class of tunable chiral cyclopentadienyl ligands bearing oxygen linkers, which were efficient catalysts for C−H arylation of benzo[h]quinolines with
An enantioselective C−H arylation of phosphine oxides with o‐quinone diazides catalyzed by an iridium(III) complex bearing an atropchiral cyclopentadienyl (Cpx) ligand and phthaloyl tert‐leucine as co‐catalyst is reported. The method allows access to a) P‐chiral biaryl phosphine oxides, b) atropo‐enantioselective construction of sterically demanding biaryl backbones, and also c) selective assembly
An efficient synthetic method for the synthesis of diazonaphthoquinones from naphthols is described. A variety of diazonaphthoquinones were synthesized from the corresponding naphthols by the diazo transfer with 2-azido-1,3-dimethylimidazolinium chloride prepared by the reaction of 2-chloro-1,3-dimethylimidazorinium chloride and sodium azide.
Various orthodiazonaphthoquinones (1-diazo-2(1H)-naphthalenones and 2-diazo-1(2H)-naphthalenones) were synthesized using the diazo-transfer reaction between the appropriate naphthol and 2-azido-1,3-dimethylimidazolinium chloride (ADMC). The ADMC was prepared by the reaction between 2-chloro-1,3-dimethylimidazolinium chloride and sodium azide. The diazo-transfer reaction selectively introduced the diazo group at the C(2) position of 1-naphthol or the C(1) position of 2-naphthol. The naphthalenediols that were tested, except for 1,3-naphthalenediol, also reacted with ADMC to afford the corresponding monodiazotized compound. X-ray analyses suggested that the diazonaphthoquinones did not have diazoniumnaphtholate structures but had diazocarbonyl structures.