“On water”-promoted direct alkynylation of isatins catalyzed by NHC–silver complexes for the efficient synthesis of 3-hydroxy-3-ethynylindolin-2-ones
作者:Xiao-Pu Fu、Li Liu、Dong Wang、Yong-Jun Chen、Chao-Jun Li
DOI:10.1039/c0gc00807a
日期:——
The direct alkynylation of isatins catalyzed by NHCâAg complexes via the activation of alkyne CâH bond on water was developed for the efficient synthesis of 3-hydroxy-3-ethynylindolin-2-ones under an air atmosphere. A remarkable rate-enhancement by water in the aqueous heterogeneous system was observed.
Development of a novel octahedron rhodium complex and its application to the alkynylation of isatin derivatives
作者:Ze-ying Wu、Zhen-wei Zhang、Lin-lin Ding、Mei Xiang、Shi-yi Luo
DOI:10.1016/j.tetlet.2020.152577
日期:2020.11
A new octahedron rhodiumcomplex was synthesized, which permits the direct activation of terminal alkynes and its reaction with isatin derivatives under an air atmosphere. An excellent yield (up to 99%) was obtained at a catalyst loading of 2 mol%.