Diastereo-, Enantio-, and <i>anti-</i>Selective Formation of Secondary Alcohol and Quaternary Carbon Stereocenters by Cu-Catalyzed Additions of B-Substituted Allyl Nucleophiles to Carbonyls
作者:Emilie Wheatley、Joseph M. Zanghi、Simon J. Meek
DOI:10.1021/acs.orglett.0c03495
日期:2020.12.4
secondary homoallylic alcohols containing α-quaternary carbon stereogenic centers in high diastereo- and enantioselectivity (up to >20:1 dr and >99:1 er) is disclosed. Transformations employ readily accessible aldehydes, allylic diboronates, and a chiral copper catalyst and proceed by γ-addition of in situ generated enantioenriched boron-stabilized allylic copper nucleophiles. The catalytic protocol
Diastereo- and Enantioselective Synthesis of Homoallylic Amines Bearing Quaternary Carbon Centers
作者:Jacob C. Green、Joseph M. Zanghi、Simon J. Meek
DOI:10.1021/jacs.9b11529
日期:2020.1.29
A Cu-catalyzed method for the efficient enantio- and diastereoselective synthesis of chiral homoallylic amines bearing a quaternary carbon and an alkenylboron is disclosed. Transformations are promoted by a readily prepared (phosphoramidite)-Cu complex, and involve bench-stable γ,γ,-disubstituted allyldiborons and benzyl imines; products are obtained in up to 82% yield, >20:1 dr, and >99:1 er. Reactions