Ligand-Controlled Regiodivergence in the Copper-Catalyzed [2,3]- and [1,2]-Rearrangements of Iodonium Ylides
作者:Bin Xu、Uttam K. Tambar
DOI:10.1021/jacs.6b08624
日期:2016.9.21
allylic ylide rearrangements for the synthesis of complex molecules, the catalyst control of [2,3]- and [1,2]-rearrangements remains an unsolved problem. We developed the first regiodivergent [2,3]- and [1,2]-rearrangements of iodonium ylides that are controlled by copper catalysts bearing different ligands. In the presence of a 2,2'-dipyridyl ligand, diazoesters and allylic iodides react via a [2,3]-rearrangement
The Allylic Azide Rearrangement: Achieving Selectivity
作者:Alina K. Feldman、Benoît Colasson、K. Barry Sharpless、Valery V. Fokin
DOI:10.1021/ja050622q
日期:2005.10.1
Allylic azides undergo a rapid [3.3]-sigmatropicrearrangement which results in dynamic equilibrium of several isomers. Thus, reactions of allylic azides usually result in mixtures of products. However, even small differences in reactivity of the isomeric allylic azides can be amplified to result in a single product in good to excellent yields. For example, the Cu(I)-catalyzed cycloaddition with alkynes
Stereocontrol in an intermolecular Schmidt reaction of equilibrating hydroxyalkyl allylic azides
作者:Ruzhang Liu、Juan Wang、Hao Wu、Xianfeng Quan、Shilin Wang、Jiandong Guo、Yang Wang、Heting Li
DOI:10.1039/d4cc00907j
日期:——
A selective intermolecular Schmidtreaction of equilibrating hydroxyalkyl allylic azides is reported to afford N-hydroxyalk-1-en-3-yl lactams in modest to high yields. For prochiral and chiral ketones, modest to high 1,5-diastereoselectivity was achieved, and the mechanistic analysis is supported by DFT calculation.