A Direct, Copper-Catalyzed Functionalization of Pyridines with Alkynes
作者:Bruce Arndtsen、Ramsay Beveridge
DOI:10.1055/s-0029-1218632
日期:2010.3
provides a route to access these products directly fromterminal alkynes and the parent pyridine, and without prefunctionalization of the pyridine core. In addition, (Z)-alk-2-enylpyridines can be prepared via a related procedure. These reactions are used to synthesize a number of new alkynyl- and alkenyl-substituted pyridines in one pot. pyridine - copper - catalytic - alkyne - alkene
Visible-light induced copper(<scp>i</scp>)-catalysed denitrogenative oxidative coupling of hydrazinylpyridines with terminal alkynes
作者:Vaibhav Pramod Charpe、Aniket A. Hande、Arunachalam Sagadevan、Kuo Chu Hwang
DOI:10.1039/c8gc01180j
日期:——
Visible light mediated copper catalysed denitrogenative oxidative coupling of 2-hydrazinopyridines with terminal alkynes to form 2-(alkyl/arylethynyl) pyridines in the presence of O2 at room temperature is reported with 42 examples. This is the first report on visible light stimulated N2 elimination by an in situ generated copper(II) superoxo/peroxo complex. N2 and water are the only by-products. The
Catalytic Enantioselective Synthesis of Pyridyl Sulfoximines
作者:Yu Tang、Scott J. Miller
DOI:10.1021/jacs.1c04431
日期:2021.6.23
past decades, whereas limited reports exist for their synthesis via asymmetric catalysis. We report the synthesis of chiral sulfoximines through the desymmetrizing N-oxidation of pyridyl sulfoximines using an aspartic acid-containing peptide catalyst. Various mono- and bis-pyridyl sulfoximine oxides are obtained with up to 99:1 er. The directing group introduced on the substrate highly enhances the
亚砜亚胺具有独特的化学和生物活性,在过去几十年中引起了极大的关注,而通过不对称催化合成它们的报道有限。我们报告了通过使用含天冬氨酸的肽催化剂对吡啶基亚砜亚胺进行去对称N-氧化来合成手性亚砜亚胺。以高达 99:1 的 er 获得各种单和双吡啶基亚砜亚胺氧化物。在底物上引入的导向基团高度增强了对映诱导,并且可以很容易地去除以产生游离的 N-H 亚砜亚胺。此外,具有甲酯和甲基酰胺C端保护基团的肽产生产物的相反对映异构体。提出了一种结合模型来解释这种现象。
Direct preparation of arylethynylzinc bromides and their application to cross-coupling reactions
作者:Seong-Ryu Joo、Jong-Sung Kim、Seung-Hoi Kim
DOI:10.1016/j.tetlet.2017.07.020
日期:2017.8
A novel synthetic protocol for the preparation of arylethynylzinc bromides has been developed. Thus-obtained organozinc reagents were successfully employed in the subsequent cross-couplingreactions with a broad range of aryl halides providing the corresponding alkynylated compounds in good to excellent yields.
A facile protocol for copper‐free palladium‐catalyzed Sonogashira coupling in aqueous media
作者:Da‐Young Jung、Soo Youl Park、Seung‐Hoi Kim
DOI:10.1002/bkcs.12432
日期:2022.1
combination of a readily available palladiumcatalyst and an eco-friendly basic aqueous solution of room-temperature ionic liquid, choline hydroxide (ChOH), was used in a facile protocol alternative to the Sonogashiracoupling reaction, alkynylation of aryl halides in the absence of a copper cocatalyst and an external base. The dual nature of ChOH to act as a base and a green solvent played a crucial role in