Catalytic Enantioselective Conjugate Allylation of Unsaturated Methylidene Ketones
作者:Laura A. Brozek、Joshua D. Sieber、James P. Morken
DOI:10.1021/ol102982b
日期:2011.3.4
The use of unsaturated methylidene ketones in catalytic conjugate allylations allows a significant expansion in substrate scope and, with appropriate chiral ligands, occurs in a highly enantioselective fashion.
Palladium-Catalyzed Chemo- and Enantioselective Oxidation of Allylic Esters and Carbonates
作者:Barry M. Trost、Jeffery Richardson、Kelvin Yong
DOI:10.1021/ja057163d
日期:2006.3.1
oxidation of allylic esters and carbonates using a novel potassium nitronate has been developed. This method is highly chemoselective, leaving other esters, alcohols, thioethers, and amines undisturbed. The oxidation can be operated in two modes: an achiral mode, using either PPh3 or rac-2 as ligand, or a chiral and highly enantioselective mode, using 2 as ligand. The oxidative enantioselective desymmetrization
Rh(I)-Catalyzed [5 + 1] Cycloaddition of Vinylcyclopropanes and CO for the Synthesis of α,β- and β,γ-Cyclohexenones
作者:Guo-Jie Jiang、Xu-Fei Fu、Qian Li、Zhi-Xiang Yu
DOI:10.1021/ol2031526
日期:2012.2.3
A cationic Rh(I)-catalyzed [5 + 1] cycloaddition of vinylcyclopropanes and CO has been developed, affording either beta,gamma-cyclohexenones as major products or alpha,beta-cyclohexenones exclusively, under different reaction conditions.
An Approach to the Synthesis of Stenine
作者:Liang Zhu、Ryan Lauchli、Mandy Loo、Kenneth J. Shea
DOI:10.1021/ol070397c
日期:2007.6.1
A type 2 N-acylnitroso intramolecular Diels-Alder reaction followed by reductive N-O bond cleavage formed the B and C rings of the Stemona alkaloid stenine. Further elaboration provided the functionalized tricyclic core.