highly efficient palladium-catalyzed Sonogashira coupling of benzylic ammonium salts with terminal alkynes is developed. This strategy provides a facile access to a series of internal alkyne derivatives in moderate to excellent yields via C-N bond cleavage and C(sp3)-C(sp) bondformation. The broad substrate scope and high functionalgroup tolerance make this reaction attractive for organic synthesis
Decarboxylative/Sonogashira-type cross-coupling using PdCl<sub>2</sub>(Cy*Phine)<sub>2</sub>
作者:Yong Yang、Yee Hwee Lim、Edward G. Robins、Charles W. Johannes
DOI:10.1039/c6ra12916a
日期:——
Expedient protocol to access a wide range of internal alkynes and symmetrical di(heteroaryl)alkynesviatandem decarboxylative–Sonogashira cross-coupling.
通过串联脱羧化-Sonogashira交叉偶联方法访问广泛的内部炔烃和对称的双(杂环烷基)炔烃。
Enantioselective Copper-Catalyzed Radical Cyanation of Propargylic C–H Bonds: Easy Access to Chiral Allenyl Nitriles
作者:Ronghua Lu、Tilong Yang、Xin Chen、Wenzheng Fan、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.1c07190
日期:2021.9.15
The first enantioselective copper-catalyzed cyanation of propargylic C–Hbonds via radical relay was established using novel BoxOTMS ligands, providing an efficient and straightforward tool for the construction of structurally diverse chiral allenyl nitriles in good yields with excellent enantioselectivities. This reaction features high functional group tolerance and mild conditions. In addition, the
Copper-Catalyzed Enantioselective Radical Esterification of Propargylic C–H Bonds
作者:Xiaotao Zhu、Hongli Bao、Jiajia Xi
DOI:10.1055/a-2240-5349
日期:2024.5
The copper-catalyzedenantioselective radical esterification of propargylic C–H bonds with tert-butyl peroxybenzoate (TBPB) as an oxidizing agent and an oxygenated nucleophile is reported. This variant of the Kharasch–Sosnovsky oxidation allows for the asymmetric esterification of open-chain carbon radicals without excessive amounts of alkyne substrates under mild reaction conditions, achieving a one-step
calcium‐catalyzed direct reduction of propargylic alcohols and ethers has been accomplished by using triethylsilane as a nucleophilic hydride source. At room temperature a variety of secondary propargylic alcohols was deoxygenated to the corresponding hydrocarbons in excellent yields. Furthermore, for the first time, a catalytic deoxygenation of tertiary propargylic alcohols was generallyapplicable. The