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。
Generation of Rhodium(I) Carbenes from Ynamides and Their Reactions with Alkynes and Alkenes
作者:Renhe Liu、Gabrielle N. Winston-McPherson、Zhong-Yue Yang、Xin Zhou、Wangze Song、Ilia A. Guzei、Xiufang Xu、Weiping Tang
DOI:10.1021/ja4047069
日期:2013.6.5
Rh(I) carbenes were conveniently generated from readily available ynamides. These metal carbene intermediates could undergo metathesis with electron-rich or neutral alkynes to afford 2-oxopyrrolidines or be trapped by tethered alkenes to yield 3-azabicyclo[3.1.0]-hexanes, a common skeleton in numerous bioactive pharmaceuticals. Although the scope of the former is limited, the latter reaction tolerates various substituted alkenes.