Enantioselective Syntheses of (-)-(<i>R</i>)-Rolipram, (-)-(<i>R</i>)-Baclofen and Other GABA Analogues via Rhodium-Catalyzed Conjugate Addition of Arylboronic Acids
作者:Günter Helmchen、Jean-Michel Becht、Oliver Meyer
DOI:10.1055/s-2003-42457
日期:——
Highly enantioselective syntheses of two important γ-aminobutyric acid (GABA) analogues, the antispastic drug (-)-(R)-Baclofen and the antidepressant agent (-)-(R)-Rolipram, are reported. Key-steps in both syntheses are the Rh-catalyzed asymmetric 1,4-additions of arylboronic acids to 4-aminobut-2,3-enoic acid derivatives.
Enantioselective Synthesisof (-)-(<i>R</i>)-Baclofen and Analoguesvia Rhodium-Catalysed Conjugate Addition of Boronic Acids
作者:Günter Helmchen、Oliver Meyer、Jean-Michel Becht
DOI:10.1055/s-2003-40847
日期:——
Highly enantioselective syntheses of the antispastic drug (-)-(R)-Baclofen and analogues have been achieved by using rhodium-catalysed asymmetric 1,4-additions of arylboronic acids to 4-amino-but-2,3-enoic acid derivatives.
Iridium-Catalyzed Asymmetric Allylic Amination with Polar Amines: Access to Building Blocks with Lead-Like Molecular Properties
作者:Paolo Tosatti、Joachim Horn、Amanda J. Campbell、David House、Adam Nelson、Stephen P. Marsden
DOI:10.1002/adsc.201000721
日期:2010.12.17
dimethyl sulfoxide (DMSO) allowed, for the first time, the systematic exploitation of highly polar, functionalized amines in asymmetricallylic substitutions: low molecular weight, sp3-rich chiral buildingblocks were obtained with physicochemical properties that will be valuable in the synthesis of lead-like small molecules.
A SELECTIVE 1,2-REDUCTION OF γ-AMINO-α,β-UNSATURATED ESTERS BY MEANS OF BF<sub>3</sub>·OEt<sub>2</sub>-DIBAL-H SYSTEM. HIGHLY VERSATILE CHIRAL BUILDING BLOCKS FROM α-AMINO ACIDS
A combination of DIBAL-H with BF3·OEt2 has been demonstrated to be a promising agent for a selective 1,2-reduction of γ-amino-α,β-unsaturated esters, which, otherwise, is difficult to realize and provides the route to potent chiral building blocks from α-amino acids.
The cysteine protease cathepsin K is a target for the treatment of diseases associated with high bone turnover. Cathepsin K is mainly expressed in osteoclasts and responsible for the destruction of the proteinaceous components of the bone matrix. We designed various fluorescent activity-basedprobes (ABPs) and their precursors that bind to and inactivate cathepsin K. ABP 25 exhibited extraordinary
半胱氨酸蛋白酶组织蛋白酶 K 是治疗与高骨转换相关疾病的靶标。组织蛋白酶 K 主要在破骨细胞中表达并负责破坏骨基质的蛋白质成分。我们设计了各种基于荧光活性的探针 (ABP) 及其与组织蛋白酶 K 结合并使其失活的前体。 ABP 25表现出非凡的效力 ( k inac / K i = 35,300 M –1 s –1 ) 和对人类组织蛋白酶 K 的选择性。晶体与 ABP 25及其非荧光前体21复合的组织蛋白酶 K 的结构被确定来表征这种新型基于丙烯酰胺的迈克尔受体的结合模式,其二苄胺部分的特定取向与引发的亚位点区域有关。含有花青素 5 的探针25允许对组织蛋白酶 K 进行灵敏检测、复杂蛋白质组中的选择性可视化以及人骨肉瘤细胞系的活细胞成像,强调其在病理生理环境中的适用性。