Enantiodivergent Atroposelective Synthesis of Chiral Biaryls by Asymmetric Transfer Hydrogenation: Chiral Phosphoric Acid Catalyzed Dynamic Kinetic Resolution
作者:Keiji Mori、Tsubasa Itakura、Takahiko Akiyama
DOI:10.1002/anie.201606063
日期:2016.9.12
enantiodivergent synthesis of chiral biaryls by a chiral phosphoric acid catalyzedasymmetrictransferhydrogenation reaction. Upon treatment of biaryl lactols with aromatic amines and a Hantzsch ester in the presence of chiral phosphoric acid, dynamic kinetic resolution (DKR) involving a reductive amination reaction proceeded smoothly to furnish both R and S isomers of chiral biaryls with excellent enantioselectivities
Gold(I)-catalyzed intramolecular [4 + 2] cycloaddition of ortho-(N-tethered 1,6-diynyl)benzaldehydes to 3,4-dihydrobenzo[f]isoquinolin-1(2H)-ones
作者:Jiankai Zhong、Rui Hu、Jingjing Sang、Weidong Rao
DOI:10.1016/j.tetlet.2020.152200
日期:2020.7
An efficient synthetic method to prepare 3,4-dihydrobenzo[f]isoquinolin-1(2H)-ones through gold(I)-catalyzed intramolecular [4 + 2] benzannulation of o-(N-tethered 1,6-diynyl)benzaldehydes at a low catalyst loading of 2 mol% is described. The product of 3,4-dihydrobenzo[f]isoquinolin-1(2H)-ones can be easily transformed to benzo[f]isoquinolin-1-ols by simply treating with phenylmagnesium bromide under
一种有效的合成方法,通过金(I)催化的邻-(N-拴系的1,6-二炔基)苯甲醛的分子内[4 + 2]苯环化制备3,4-二氢苯并[ f ]异喹啉-1(2H)-酮。描述了在2mol%的低催化剂载量下的催化剂。3,4-二氢苯并[ f ]异喹啉-1(2H)-one的产物可以通过在温和的条件下简单地用苯基溴化镁处理而轻易地转化为苯并[ f ]异喹啉-1-醇。化合物2o和2w的结构也通过X射线晶体学分析确定。
A Novel Palladium-Mediated Cascade Reaction Triggered by Strain Release of the Cyclobutane System. A New General Route to Benzo- and Naphthohydrindans
A novel palladium-mediated cascade reaction was reported. By this procedure, the olefinic cyclobutanols 17, 24, and 31; 41; 37; and 45 afforded the benzo-and naphthohydrindans (46-49, 50-53, 54-57, and 58-61) respectively in one operation in the ratios depending on the mediators and solvents employed. This provides a novel and efficient synthesis of biologically important A-nor and C-11-alkylated steroids.