Enantioselective epoxidation of conjugated dienes and enynes. Trans-epoxides from cis-olefins
作者:Nam Ho Lee、Eric N. Jacobsen
DOI:10.1016/0040-4039(91)80212-o
日期:1991.11
Asymmetric epoxidation of conjugated dienes and enynes catalyzed by (salen)Mn(III) complex 1 takes place with high chemoselectivity to afford monoepoxides exclusively. Reactions of cis-enynes proceed with very high levels of asymmetric induction, with trans-alkynyl epoxides as the major products.
Nickel-Catalyzed Enantioselective Coupling of Aldehydes and Electron-Deficient 1,3-Dienes Following an Inverse Regiochemical Course
作者:Thomas Q. Davies、Jae Yeon Kim、Alois Fürstner
DOI:10.1021/jacs.2c09328
日期:2022.10.19
The nickel catalyzed reductive coupling of aldehydes with sorbate esters and related electron-deficient 1,3-dienes are known in the literature to occur at the π-bond proximal to the ester to afford aldol-type products. In stark contrast to this established path, a VAPOL-derived phosphoramidite ligand in combination with a bench-stable nickel precatalyst brokers a regiocomplementary course in that C–C