Two‐in‐One Strategy for Palladium‐Catalyzed C−H Functionalization in Water
作者:Huiying Zeng、Zemin Wang、Chao‐Jun Li
DOI:10.1002/anie.201813391
日期:2019.2.25
Transition metal catalyzedC−Hfunctionalizations have been developed as powerful methods for C−C bond formations. Directing groups, removable directing groups, traceless directing groups, and transient directing groups (TDGs) have been successfully used to improve the reaction efficiencies. For the development of greener and more sustainable methods, C−Hfunctionalization using a TDG that also serves
Construction of Spirocyclic Tetrahydro-β-carbolines via Cross-Annulation of Phenols with Tryptamines in Water
作者:Zemin Wang、Jiabin Niu、Huiying Zeng、Chao-Jun Li
DOI:10.1021/acs.orglett.9b02613
日期:2019.9.6
degradation of lignin resource. Palladium-catalyzed conversion of phenols to tetrahydro-β-carboline skeletons bearing a spirocycle at the C-1 position in water is reported. Various substituted phenols are successfully cross-annulated with different tryptamines via sequential C(Ar)-O bondcleavage of phenols, C-H bond activation of tryptamines, and C-N/C-C bond formations. This method provides a new protocol
Gold-Catalyzed Intramolecular Tandem Cyclization of Indole-Ynamides: Diastereoselective Synthesis of Spirocyclic Pyrrolidinoindolines
作者:Nan Zheng、Yuan-Yuan Chang、Li-Jie Zhang、Jian-Xian Gong、Zhen Yang
DOI:10.1002/asia.201500865
日期:2016.2
A gold‐catalyzed intramoleculartandemcyclization of indole‐ynamide affords tetracyclic spirocyclicpyrrolidinoindoline bearing an all‐carbon quaternary stereocentre in a single step; however, when the reaction was carried out in the presence of BF3⋅Et2O, the corresponding tricyclic spirocyclicpyrrolidinoindoline‐based enones are produced through a key 1,5‐hydride shift. The developed chemistry provides