Rhodium(III)-Catalyzed C–H Activation and Annulation with 1-Alkynylphosphine Sulfides: A Mild and Regioselective Access for the Synthesis of Bulky Phosphine Ligands
作者:Bin Li、Jie Yang、Hong Xu、Haibin Song、Baiquan Wang
DOI:10.1021/acs.joc.5b02265
日期:2015.12.18
We reported herein rhodium(III)-catalyzed C–H activation and annulation reactions for the synthesis of bulky phosphine ligands by using 1-alkynylphosphine sulfides as key starting materials. In the presence of [Cp*RhCl2]2 (5 mol %) and CsOAc (2.0 equiv), various N-(pivaloyloxy)benzamides (3.0 equiv) could react smoothly with 1-alkynylphosphine sulfides at 40 °C in MeOH/CF3CH2OH cosolvent without external
Lossen rearrangement by Rh(<scp>iii</scp>)-catalyzed C–H activation/annulation of aryl hydroxamates with alkynes: access to quinolone-containing amino acid derivatives
作者:Dmitry A. Petropavlovskikh、Daria V. Vorobyeva、Ivan A. Godovikov、Sergey E. Nefedov、Oleg A. Filippov、Sergey N. Osipov
DOI:10.1039/d1ob01711j
日期:——
convenient and robust method for the preparation of new CF3-containing 2-quinolones has been developed via a Rh(III)-catalyzed C–H activation/Lossenrearrangement/annulation cascade of N-pivaloyloxy-arylamides with internal alkynes bearing an α-CF3-α-amino acid moiety on the triple bond. This work expands the scope of valuable products that are available through C–H activation/annulation reactions of
通过Rh( III )催化的C-H活化/ Lossen重排/环化级联N-新戊酰氧基-芳基酰胺与内部带有α三键上的-CF 3 -α-氨基酸部分。这项工作扩大了通过芳基酰胺在有机合成中的 C-H 活化/环化反应可获得的有价值产品的范围。
Rhodium-Catalyzed CH Alkynylation of Arenes at Room Temperature
作者:Chao Feng、Teck-Peng Loh
DOI:10.1002/anie.201309198
日期:2014.3.3
The rhodium(III)‐catalyzed ortho CH alkynylation of non‐electronically activated arenes is disclosed. This process features a straightforward and highly effective protocol for the synthesis of functionalized alkynes and represents the first example of merging a hypervalent iodine reagent with rhodium(III) catalysis. Notably, this reaction proceeds at room temperature, tolerates a variety of functional
An efficient synthesis of 2,5-disubstitutedoxazolesvia Co(III) catalysis is described herein. The synthesis is achieved under mild conditions through [3+2] cycloaddition of N-pivaloyloxyamides and alkynes. The reaction operates through an internal oxidation pathway and features a very broad substrate scope. The one-step synthesis of natural products such as texamine and balsoxin has been demonstrated
[4+2] or [4+1] Annulation: Changing the Reaction Pathway of a Rhodium-Catalyzed Process by Tuning the Cp Ligand
作者:Seung Youn Hong、Jisu Jeong、Sukbok Chang
DOI:10.1002/anie.201612559
日期:2017.2.20
A change in reaction pathway was achieved for the first time by tuning the cyclopentadienyl (Cp) ligand used for the rhodium‐catalyzed cyclization of benzamides with conjugated enynones. Depending on the Cp ligand, the reaction pathway switched between [4+2] and [4+1] annulation. Electronic effects turned out to be crucial for the product distribution. The dichotomy was attributed to the alteration