The Palladium-Catalyzed Aerobic Kinetic Resolution of Secondary Alcohols: Reaction Development, Scope, and Applications
作者:Davidâ C. Ebner、Jeffreyâ T. Bagdanoff、Ericâ M. Ferreira、Ryanâ M. McFadden、Danielâ D. Caspi、Raissaâ M. Trend、Brianâ M. Stoltz
DOI:10.1002/chem.200902172
日期:2009.12.7
and tert‐butyl alcohol greatly enhances reaction rates, promoting rapid resolutions. The use of chloroform as solvent allows the use of ambient air as the terminal oxidant at 23 °C, resulting in enhanced catalyst selectivity. These improved reaction conditions have permitted the successful kineticresolution of benzylic, allylic, and cyclopropyl secondary alcohols to high enantiomeric excess with good‐to‐excellent
已经开发出第一个钯催化的仲醇对映选择性氧化反应,利用容易获得的二胺(-)-金雀花石作为手性配体,分子氧作为化学计量氧化剂。关于碱基和氢键供体作用的机制见解导致了对原始系统的一些改进。也就是说,碳酸铯和叔丁醇的添加大大提高了反应速率,促进了快速分辨率。使用氯仿作为溶剂允许在 23 °C 下使用环境空气作为终端氧化剂,从而提高催化剂选择性。这些改进的反应条件使得能够以良好至优异的选择性因子成功地将苄基、烯丙基和环丙基仲醇动力学拆分为高对映体过量。该催化剂体系也已应用于内消旋二醇的去对称化,提供高产率的对映体富集的羟基酮。
De Novo Synthesis of Benzannelated Heterocycles
作者:Johannes Feierfeil、Thomas Magauer
DOI:10.1002/chem.201705662
日期:2018.1.26
functionalize commercially available heterocycles or resort to transformations that make use of benzene‐derived building blocks. Here, we report a powerful cascade reaction that enables the de novo construction of variouslysubstituted indoles, indazoles, benzofurans and benzothiophenes fromreadily available bicyclo[3.1.0]hexan‐2‐ones. The transformation can be conducted under mild, non‐anhydrous conditions
palladium‐catalyzed asymmetricallylicalkylation reaction with diorganozinc reagents, which displays broad functional group compatibility, is reported. This novel transformation hinges on a remarkableligandeffect which overrides the standard “umpolung” reactivity of allyl–palladium intermediates in the presence of dialkylzincs. Owing to its mild conditions, enantioselective allylicalkylations of racemic
An aqueous chemoenzymatic cascade reaction combining Pd-catalyzed C–C formation and enzymatic CC asymmetric hydrogenation (AH) was developed for enantioselective synthesis of tertiary α-aryl cycloketones in good yields and excellent enantioselectivities. The stereopreference of the enzyme in AH of α-aryl cyclohexenones was studied. An enantiocomplementary enzyme was obtained by site-directed mutation
[EN] CYCLIC AMINE SUBSTITUTED OXAZOLIDINONE CETP INHIBITOR<br/>[FR] INHIBITEUR DE CETP SUBSTITUÉ PAR DES AMINES CYCLIQUES À BASE D'OXAZOLIDINONE
申请人:MERCK SHARP & DOHME
公开号:WO2012058187A1
公开(公告)日:2012-05-03
CCompounds having the structure of Formula I, including pharmaceutically acceptable salts of the compounds, are CETP inhibitors and are useful for raising HDL-cholesterol, reducing LDL-cholesterol, and for treating or preventing atherosclerosis. In the compound of Formula I, A3 is a substitiuted phenyl group or indanyl group.Formula (I).