Transition metal‐catalyzed domino reactions have been used as powerful tools for the preparation of polysubstituted furans in a one‐pot manner. In this paper, an efficient synthetic method was developed for the construction of tri‐ or tetrasubstituted furans from electron‐deficient alkynes and 2‐yn‐1‐ols by a silver‐catalyzed domino reaction. It is especially noteworthy that a 2,3,5‐trisubstituted
Copper-catalyzed, silver-mediated formal [3+2] cycloaddition of simple alkynes with β-ketoesters through propargylic C(sp<sup>3</sup>)–H functionalization
作者:Zhen-Ting Liu、Xiang-Ping Hu
DOI:10.1039/c8cc08013e
日期:——
thus providing a variety of highly functionalized furans in moderate to high yields. This represents the first successful example of the catalytic propargylic cycloaddition of simple alkynes with bisnucleophiles based on the propargylic C(sp3)–H functionalization strategy.
通过炔丙基的C(sp 3)–H官能化,实现了铜催化的炔烃与β-酮酸酯的炔丙基[3 + 2]环加成反应。在CuI与1,10-菲咯啉水合物作为配体和Ag 2 CO 3作为双功能试剂(氧化剂和碱)的催化下,反应可在较宽的底物范围内顺利进行,从而提供了多种高官能度的呋喃中度到高产。这代表了基于炔丙基C(sp 3)-H官能化策略的简单炔烃与双亲核试剂催化炔丙基环加成的第一个成功实例。