Desymmetrization of Cyclohexadienones Containing a Quaternary γ-Carbon Atom by Conjugate Addition of Boron Nucleophiles
作者:Zhi-Yuan Zhao、Ming Cui、Anne A. Poletti、Elisabeth Irran、Martin Oestreich
DOI:10.1021/acscatal.3c04725
日期:2024.1.5
A highlyenantio- and diastereoselective copper-catalyzed conjugate monoborylation of γ,γ-disubstituted cyclohexadienone derivatives is reported. Two contiguous stereocenters are generated in this group-selective reaction, one at the formed boron-bearing carbon atom in a neopentylic position and one at the quaternary carbon atom. A subsequent 1,4-addition of a boron nucleophile to the remaining α,β-unsaturated
Synthesis of All-Carbon, Quaternary Center-Containing Cyclohexenones through an Organocatalyzed, Multicomponent Coupling
作者:Hua Yang、Rich G. Carter
DOI:10.1021/ol1011955
日期:2010.7.2
Organocatalyzed multicomponent coupling using a new ester-containing, proline aryl sulfonamide has been developed for accessing densely functionalized cyclohexenones, each containing a quaternary center in high enantio- and diastereoselectivity. In contrast to most enamine/iminium-catalyzed reactions, the use of molecular sieves was critical to optimum enantioselectivity.