1,3-Dioxa-[3,3]-sigmatropic Oxo-Rearrangement of Substituted Allylic Carbamates: Scope and Mechanistic Studies
作者:Maddalen Agirre、Sylvain Henrion、Ivan Rivilla、José I. Miranda、Fernando P. Cossío、Bertrand Carboni、José M. Villalgordo、François Carreaux
DOI:10.1021/acs.joc.8b01320
日期:2018.12.21
alkenyl-substituted allylic alcohols with activated isocyanates is reported. The reorganization of bonds is highly dependent on the electron density of the aromatic ring and the nature of isocyanate used. This metal-free tandem reaction from branched allyl alcohols initiated by a carbamoylation reaction and followed by a sigmatropic rearrangement thus offers a new access to (E)-cinnamyl and conjugated (E,E)-diene
Substrate scope and stereocontrol in the Rh(II)-catalysed oxyamination of allylic carbamates
作者:William P. Unsworth、Scott G. Lamont、Jeremy Robertson
DOI:10.1016/j.tet.2014.06.051
日期:2014.10
Application of a modified Du Bois protocol for rhodium-stabilised nitrenoid generation to a variety of allylic carbamates results in 4-acetoxymethyl-1,3-oxazolidin-2-one derivatives with moderate to high levels of stereocontrol. (C) 2014 Elsevier Ltd. All rights reserved.