Enantioselective Addition of Dialkylzincs to Aldehydes Catalyzed by (−)-MITH
作者:Ying-Ni Cheng、Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ying Shen、Biing-Jiun Uang
DOI:10.1002/asia.201200676
日期:2012.12
imparts high enantioselectivity has been disclosed for the synthesis of optically active alcohols, which may undergo further chemical transformations. The enantioselective alkylation of aldehydes with dialkylzincs to afford the corresponding optically active alcohols with excellent enantioselectvities has been achieved in the presence of 0.1–0.5 mol % of the camphor‐derived chiral ligand (−)‐2‐exo
Conformationally restricted perhydrobenzoxazines have been demonstrated to be good chiral ligands for one-pot asymmetric ethylation/epoxidation, and the unprecedented arylation/epoxidation of trisubstituted α,β-unsaturated aldehydes. The scope of the reaction has been studied and a wide set of substrates with allylic strain of different nature has been explored, obtaining good or total diastereoselectivities
Highly Enantio- and Diastereoselective One-Pot Synthesis of Acyclic Epoxy Alcohols with Three Contiguous Stereocenters
作者:Alice E. Lurain、Aaron Maestri、Ann Rowley Kelly、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1021/ja046750g
日期:2004.10.1
Two highly enantio- and diastereoselective one-pot procedures for the synthesis of epoxy alcohols with up to three contiguous stereocenters are reported. Route one involves asymmetricaddition of an alkylzinc reagent to an enal followed by diastereoselective epoxidation. Route two entails asymmetric vinylation of an aldehyde with divinylzinc reagents and subsequent diastereoselective epoxidation. The
CuH-Catalyzed Enantioselective 1,2-Reductions of α,β-Unsaturated Ketones
作者:Ralph Moser、Žarko V. Bošković、Christopher S. Crowe、Bruce H. Lipshutz
DOI:10.1021/ja102689e
日期:2010.6.16
The first study on a general technology for arriving at valued nonracemic allylic alcohols using asymmetricligand-acceleratedcatalysis by copper hydride is described.
描述了使用氢化铜的不对称配体加速催化获得有价值的非外消旋烯丙醇的通用技术的第一项研究。
Tail-Tied Ligands: An Immobilized Analogue of (R)-2-Piperidino-1,1,2-triphenylethanol with Intact High Catalytic Activity and Enantioselectivity
作者:Miquel A. Pericàs、David Castellnou、Israel Rodríguez、Antoni Riera、Lluís Solà
DOI:10.1002/adsc.200303125
日期:2003.12
A functional analogue of (R)-2-piperidino-1,1,2-triphenylethanol was synthesized and anchored to different polymeric supports by a position remote from the active region. This strategy, leading to what we call a tail-tiedligand, allows for the achievement of the optimal transition state geometry in the catalytic process. The catalyticactivity of the resulting heterogenized ligands was investigated