The Palladium Catalyzed Asymmetric Addition of Oxindoles and Allenes: An Atom-Economical Versatile Method for the Construction of Chiral Indole Alkaloids
作者:Barry M. Trost、Jia Xie、Joshua D. Sieber
DOI:10.1021/ja209244m
日期:2011.12.21
The Pd-catalyzed asymmetricallylicalkylation (AAA) is one of the most useful and versatile methods for asymmetric synthesis known in organometallic chemistry. Development of this reaction over the past 30 years has typically relied on the use of an allylic electrophile bearing an appropriate leaving group to access the reactive Pd(π-allyl) intermediate that goes on to the desired coupling product
sequential arylation–allylation of o-bromoanilides and leads to the construction of oxindolesbearing a full carbonquaternarycenter. The cheap triphenylphosphine was proved to be a highly effective ligand for this one pot transformation. On the basis of this new method, esermethole and its analogues were synthesized.
BF3·Et2O catalyzed allylation of oxindoles with allyl trichloroacetimidate
作者:Jiao Ma、Ling Zhou、Jie Chen
DOI:10.1016/j.tetlet.2015.01.155
日期:2015.3
An efficient Lewis acid catalyzed allylation of 3-substituted oxindoles has been developed for the first time using allyl trichloroacetimidate as an electrophile under mild reaction conditions. (C) 2015 Elsevier Ltd. All rights reserved.
Highly Chemo- and Enantioselective Synthesis of 3-Allyl-3-aryl Oxindoles via the Direct Palladium-Catalyzed α-Arylation of Amides
A new NHC·Pd-catalyzed asymmetric α-arylation of amides is reported that gives direct access to synthetically valuable, allylated oxindoles with quaternary carbon centers. The reaction is made possible by the introduction of a new chiral NHC ligand. The palladium complexes derived therefrom combine excellent reactivity with high chemo- and enantioselectivity for the title transformation.