A facile Zr-mediated multicomponent approach to arylated allylic alcohols and its application to the synthesis of highly substituted indenes and spiroindenes
作者:Shenghai Guo、Yuanhong Liu
DOI:10.1039/b804888f
日期:——
and one-pot procedure for the synthesis of arylated and stereodefined allylic alcohols has been achieved through zirconium-mediated multicomponent coupling reactions of alkynes, aldehydes (or ketones), and aryl iodides. The subsequent intramolecular Friedel-Crafts reactions of these allylic alcohols catalyzed by Bronsted or Lewis acids afford highly substitutedindenes and spiroindenes under extremely
Studies on the zirconium-mediated alkyne–aldehyde coupling reactions: a facile synthesis of stereodefined allylic alcohols and (Z)-2-en-4-yn-1-ols
作者:Shenghai Guo、Hao Zhang、Feijie Song、Yuanhong Liu
DOI:10.1016/j.tet.2006.12.051
日期:2007.2
An improved zirconium-mediated alkyne–aldehyde cross-coupling reaction has been achieved to afford the stereodefined (Z)-allylic alcohols or 3-iodinated allylicalcoholsselectively via protonolysis or iodinolysis of the corresponding five-membered oxazirconacycles. This method has also been successfully applied to the synthesis of (Z)-enynols through cross-coupling reactions of three different components
Gold-Catalyzed Direct Amination of Allylic Alcohols
作者:Yuanhong Liu、Shenghai Guo、Feijie Song
DOI:10.1055/s-2007-973865
日期:2007.4
An efficient and direct synthesis of allylic amines from allylic alcohols was developed by utilization of gold complexes as catalysts under mild reaction conditions. AuCl 3 proved to be a better catalyst than a cationic gold(I) complex of AuCl(PPh 3 )/AgOTf.
A novel reaction of titanacyclopentenes and aldehydes with or without Lewis acids
作者:Qiaoshu Hu、Dongzhen Li、Huijun Zhang、Zhenfeng Xi
DOI:10.1016/j.tetlet.2007.06.149
日期:2007.8
Oxatitanacyclopentenes were prepared in high yields from the reaction of aldehydes with titanacyclopenetens via substitution of ethylene. No insertion product was obtained in this reaction. The combination of alkynes and aldehydes played an important role in the successive formation of oxatitanacyclopentenes. Some oxatitanacyclopentenes are very stable and can be purified using column chromatography. The cooperation between Ti and LA led to very different results from that between Zr and LA. (c) 2007 Elsevier Ltd. All rights reserved.