Allylboration of Ketones and Imines with a Highly Reactive Bifunctional Allyl Pinacolatoboronate Reagent
作者:Jiaming Liu、Xinbo Tong、Ming Chen
DOI:10.1021/acs.joc.9b03222
日期:2020.4.17
Allylboration of ketones and imines with a bifunctional allylboron reagent is reported. Addition of the bifunctional allylboronate to a broad scope of ketones gave tertiary alcohols in excellent yields at ambient temperature without any catalyst or additive. Allylboration of cyclic aldimines also proceeded to give allylated products in good yields under the same reaction conditions. The allylsilane
Rhodium-Catalyzed Asymmetric Addition of Organoboronic Acids to Aldimines Using Chiral Spiro Monophosphite-Olefin Ligands: Method Development and Mechanistic Studies
作者:Huanyu Shan、Qiaoxia Zhou、Jinglu Yu、Shuoqing Zhang、Xin Hong、Xufeng Lin
DOI:10.1021/acs.joc.8b01764
日期:2018.10.5
on a hexamethyl-1,1′-spirobiindane scaffold was accomplished starting from Bisphenol C. The optimal ligand could serve as an elegant chiral bidentate ligand in the Rh-catalyzed asymmetric 1,2-addition of organoboronic acids to various acyclic/cyclic aldimines, leading to chiral amines with high yields and excellent enantioselectivities. Detailed stereochemical models for enantioselective induction
A Ni(II)-catalyzed asymmetric addition of arylboronic acids to cyclic aldimines and ketimines is reported. Our tropos phosphine-oxazoline biphenyl ligand is crucial for the high catalytic activity, which coordinates to Ni(II)...
Enantioselective Construction of Tetrahydroquinazoline Motifs via Palladium-Catalyzed [4 + 2] Cycloaddition of Vinyl Benzoxazinones with Sulfamate-Derived Cyclic Imines
A palladium-catalyzed enantioselective [4 + 2] cycloadditionreaction of vinyl benzoxazinones with sulfamate-derived cyclic imines is described, affording the tetrahydroquinazolines bearing several functional rings in high yields (up to 99% yield) with good to excellent diastereoselectivities and excellent enantioselectivities (up to 96% ee). This reaction represents the first Pd-catalyzed asymmetric
作者:Hao Guo、Lie‐Wei Zhang、Hao Zhou、Wei Meng、Yu‐Fei Ao、De‐Xian Wang、Qi‐Qiang Wang
DOI:10.1002/anie.201910399
日期:2020.2.10
catalyze the decarboxylative Mannich reaction of cyclic aldimines containing a sulfamate heading group. The imine substrate can be activated toward nucleophilic attack of β-ketoacid by a cooperative hydrogen-bonding network enabled by sulfamate-induced dimerization assembly of the macrocycle catalysts. Highly efficient (>95 % yield in most cases) and enantioselective (up to 97.5:2.5 er) transformation