Rh(I)-Catalyzed Carbene Migration/Carbonylation/Cyclization: Straightforward Construction of Fully Substituted Aryne Precursors
作者:Guohao Zhu、Wen-Chao Gao、Xuefeng Jiang
DOI:10.1021/jacs.0c13012
日期:2021.1.27
The Rh(I)-catalyzed cascade formation of carbenoid followed by a carbonylative cyclization of silyl diynes has been established to achieve diverse ortho silyl-substituted phenolics, enabling access to fully substituted aryne precursors via a one-step fluorosulfurylation. The silyl mask on the termini of alkynes is demonstrated not only to suppress the undesired oxidation but also to control the selectivity
已经建立了 Rh(I) 催化级联形成卡宾,然后甲硅烷基二炔的羰基化环化,以实现多种邻甲硅烷基取代的酚类化合物,从而能够通过一步氟磺酰化获得完全取代的芳炔前体。炔烃末端的甲硅烷基掩膜不仅可以抑制不需要的氧化,还可以控制 CO 插入的选择性。全面建立了对完全取代芳烃的直接访问,并将其应用于多环芳族分子的高效构建。
Cationic Pd(II)-Catalyzed Reductive Cyclization of Alkyne-Tethered Ketones or Aldehydes Using Ethanol as Hydrogen Source
作者:Kun Shen、Xiuling Han、Xiyan Lu
DOI:10.1021/ol400531a
日期:2013.4.5
A cationic Pd(II)-catalyzed reductivecyclization of alkyne-tethered ketones or aldehydes usingethanol as hydrogensource under mild conditions was developed. The reaction is an environmentally benign synthetic method and proceeds efficiently to give useful N-heterocycles or carbocycles bearing an exocyclic double bond and a hydroxyl group in high yield.
Synthesis of Substituted Piperidines via Cationic Palladium(II)-Catalyzed Reductive Coupling of N-Tosyl-Tethered Alkynones
作者:Xiaojuan Zhang、Xiuling Han、Zhiyong Hu、Xiyan Lu
DOI:10.1055/s-0036-1588803
日期:2017.10
the Special Topic Modern Strategies for Heterocycles Synthesis Abstract A cationic palladium(II) complex catalyzed reductivecoupling of N-tosyl-tethered alkynones for the synthesis of functionalized piperidines was successfully developed. This reaction was initiated by hydropalladation of the alkyne and quenched by addition to the intramolecular carbonyl group. The substituent on the alkyne is key