Mechanism of Gold(I)-Catalyzed Rearrangements of Acetylenic Amine-<i>N</i>-Oxides: Computational Investigations Lead to a New Mechanism Confirmed by Experiment
作者:Elizabeth L. Noey、Yingdong Luo、Liming Zhang、K. N. Houk
DOI:10.1021/ja208860x
日期:2012.1.18
Quantum mechanical studies of the mechanism of gold-catalyzed rearrangements of acetylenic amine-N-oxides to piperidinones or azepanones have revealed a new mechanism involving a concerted heteroretroene reaction, formally a 1,5 hydrogen shift from the N-alkyl groups to the vinyl position of a gold-coordinated methyleneisoxazolidinium or methyleneoxazinanium. Density functional calculations (B3LYP
Copper-Catalyzed Asymmetric Reduction of β,β-Disubstituted Alkenylboramides
作者:Yeji Park、Jaesook Yun
DOI:10.1021/acs.orglett.9b03400
日期:2019.11.1
A highly enantioselective copper-catalyzed reduction of β,β-disubstituted alkenylboron compounds was developed using hydrosilane. The copperhydride catalyst coordinated with chiral Josiphos ligand efficiently discriminated β-geminal substituents to generate corresponding β-chiral alkylboramides with excellent enantioselectivities up to 99% ee. The enantioselective reduction protocol provides a facile
Gold-catalyzed efficient synthesis of azepan-4-ones via a two-step [5 + 2] annulation
作者:Li Cui、Longwu Ye、Liming Zhang
DOI:10.1039/c001314e
日期:——
A surprisingly efficient synthesis of azepan-4-ones via a two-step [5â+â2] annulation is developed. This reaction involves a key gold catalysis and shows generally high regioselectivities and good to excellent diastereoselectivities.