Chiral [RuCl2(dipyridylphosphane)(1,2-diamine)] Catalysts: Applications in Asymmetric Hydrogenation of a Wide Range of Simple Ketones
作者:Jing Wu、Jian-Xin Ji、Rongwei Guo、Chi-Hung Yeung、Albert S. C. Chan
DOI:10.1002/chem.200204688
日期:2003.7.7
The dipyridylphosphane/diamine-Ru complex combined with tBuOK in 2-propanol acts as a very effective catalyst system for the enantioselective hydrogenation of a diverse range of simple ketones including heteroaromatic ketones, substituted benzophenones, alkenyl ketones, and cyclopropyl ketones. The combination of desirable features, such as quantitative chemical yields within hours, broad substrate
Dynamic Processes in the Copper-Catalyzed Substitution of Chiral Allylic Acetates Leading to Loss of Chiral Information
作者:Jakob Norinder、Jan-E. Bäckvall
DOI:10.1002/chem.200601684
日期:2007.5.7
formation. Equilibration of the reaction intermediates is of importance for a possible development of a dynamickineticasymmetrictransformation (DYKAT) process, in which a chiral catalyst is used to produce an optically active product from a racemicsubstrate, by means of a dynamic equilibrium of the diastereomeric reaction intermediates.
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
[EN] PROCESSES FOR HIGHLY ENANTIO-AND DIASTEREOSELECTIVE SYNTHESIS OF ACYCLIC EPOXY ALCOHOLS AND ALLYLIC EPOXY ALCOHOLS<br/>[FR] PROCEDES DE SYNTHESE HAUTEMENT ENANTIOSELECTIVE ET DIASTEREOSELECTIVE D'EPOXYALCOOLS ACYCLIQUES ET D'EPOXYALCOOLS ALLYLIQUES
申请人:UNIV PENNSYLVANIA
公开号:WO2005087755A1
公开(公告)日:2005-09-22
The inventive subject matter relates to novel processes for making an epoxy alcohol from an aldehyde, comprising the steps of: (a) adding (i) an organozinc compound or (ii) divinylzinc compound and an diorganozinc compound to said aldehyde in the presence of a first catalyst to form an allylic alkoxide compound; and (b) epoxidizing said allylic alkoxide compound in the presence of an oxidant and a second catalyst.
conditions for 2 h with less than 35% oxidation of the DNA chain. An assay measuring the diastereo- and enantioselectivity of the photosensitized enereaction of mesitylol with singletoxygen was set up that provides diastereomeric ratios via NMR of aliquots of the reaction solution. Enantiomers were separated gas chromatographically on a chiral stationary phase and were assigned based on the product distribution
DNA介导的纳米结构的最新发展为新型反应中心的发展铺平了道路。作为卟啉催化反应的纳米结构反应中心项目的一部分,我们开发了四(对羟基苯基)卟啉-寡核苷酸杂化物的固相合成。在这些杂合体中,多达四个核酸链通过磷酸二酯键与卟啉的酚取代基相连。发现具有 TTAA 序列的一条寡核苷酸链的代表性杂种在有氧条件下可在光照射下存活 2 小时,且 DNA 链的氧化低于 35%。建立了一种测定异丙醇与单线态氧的光敏烯反应的非对映选择性和对映选择性的测定法,该测定法通过反应溶液等分试样的 NMR 提供非对映异构体比率。对映异构体在手性固定相上进行气相色谱分离,并根据对映异构体富集的起始材料获得的产物分布进行分配。我们的结果是探索基于 DNA 和卟啉的纳米结构反应介质的起点。