The first chiral diene-based metal–organic frameworks for highly enantioselective carbon–carbon bond formation reactions
作者:Takahiro Sawano、Pengfei Ji、Alexandra R. McIsaac、Zekai Lin、Carter W. Abney、Wenbin Lin
DOI:10.1039/c5sc02100f
日期:——
We have designed the first chiral diene-based metal-organic framework (MOF), E2-MOF, and postsynthetically metalated E2-MOF with Rh(I) complexes to afford highly active and enantioselective single-site solid catalysts for C-C bond...
Chemoenzymatic Synthesis and Application of Bicyclo[2.2.2]octadiene Ligands: Increased Efficiency in Rhodium-Catalyzed Asymmetric Conjugate Additions by Electronic Tuning
作者:Yunfei Luo、Andrew J. Carnell
DOI:10.1002/anie.200907033
日期:2010.4.1
On your bi(cycle)ke! A series of 1,4‐dimethyl bicyclic [2.2.2] diene ligands with tunable substitution at the bridge positions was accessed using a lipase resolution and a high yielding six step sequence (see scheme). The bridgehead methyl groups improve efficiency allowing less aryl boronic acid to be used in the title reaction.
A series of novel chiral diene ligands (1R,4S)-L1, which are based on the bicyclo[2.2.1]heptadiene skeleton and are substituted with methyl and an ester group at the bridgehead carbons, were synthesized through rhodium-catalyzed asymmetric arylative bis-cyclization of 1,6-enyne 1 as a key step. The rhodium catalyst with one of the (1R,4S)-L1 ligands was used for the asymmetric bis-cyclization of 1
Asymmetric Umpolung Hydrogenation and Deuteration of Alkenes Catalyzed by Nickel
作者:Siyu Guo、Xiuhua Wang、Jianrong Steve Zhou
DOI:10.1021/acs.orglett.0c00112
日期:2020.2.7
enantioselectivity, using acetic acid or water as the hydrogen source and indium powder as electron donor. The scope of alkenes herein include α,β-unsaturated esters, nitriles, and ketones as well as allylicalcohols. Asymmetric deuteration of α,β-unsaturated esters is also achieved with deuterated water, the cheapest deuterium source.
A catalytic asymmetric conjugate arylation of acyclic alpha,beta-unsaturated ketones with arylboronicacids was catalyzed by 3 mol% of chiral amidomonophosphane 1-rhodium(I) in the presence of potassium hydroxide in a mixture of 1,4-dioxane and water at 70 degrees C to afford 1,4-conjugate arylated acyclic ketones with high enantiomeric excess in high chemical yield. Thirteen examples of the reaction