Asymmetric Synthesis of Chiral Primary Amines by Transfer Hydrogenation of <i>N</i>-(<i>tert</i>-Butanesulfinyl)ketimines
作者:David Guijarro、Óscar Pablo、Miguel Yus
DOI:10.1021/jo101057s
日期:2010.8.6
The diastereoselective reduction of (R)-N-(tert-butanesulfinyl)ketimines by a ruthenium-catalyzed asymmetrictransferhydrogenation process in isopropyl alcohol, followed by desulfinylation of the nitrogen atom, is an excellent method to prepare highly enantiomerically enriched α-branched primary amines (up to >99% ee) in short reaction times (1−4 h). (1S,2R)-1-Amino-2-indanol has been shown to be
Optically Active Amines by Enzyme-Catalyzed Kinetic Resolution
作者:Klaus Ditrich
DOI:10.1055/s-2008-1078451
日期:2008.7
Chiral amines are resolved by an enzyme-catalyzed kineticresolution. Key steps are the selective acylation of one enantiomer with isopropyl methoxyacetate, separation of the resulting amide from the unreacted antipode, and finally amide hydrolysis. The process proceeds with excellent selectivity and is highly flexible with regard to substrates.
Concise synthesis of Azilect <i>via</i> cobalt-catalyzed enantioselective hydrogenation in a bio-based solvent
作者:Soumyadeep Chakrabortty、Felix J. de Zwart、Demi D. Snabilié、Ekambaram Balaraman、Joost N. H. Reek、Bas de Bruin、Johannes G. de Vries
DOI:10.1039/d3cy01292a
日期:——
An asymmetric synthesis of rasagiline (Azilect), an anti Parkinson's therapeutic, was developed employing an earth-abundant metal catalyst in a bio-based solvent. The asymmetric hydrogenation of the indanone-derived enamide was performed using [Co(OTf)2]/(S,S)-PhBPE as the precatalyst as the key step for enantioselection. The effect on enantio-induction in structurally different indenyl acetamides
雷沙吉兰 (Azilect) 是一种抗帕金森氏症治疗药物,其不对称合成方法是在生物基溶剂中采用地球上丰富的金属催化剂开发的。以[Co(OTf) 2 ]/( S , S ) -Ph BPE为预催化剂,对茚满酮衍生的烯酰胺进行不对称氢化,这是对映体选择的关键步骤。还检查了结构不同的茚基乙酰胺对对映体诱导的影响。雷沙吉兰的合成总收率为 70%,ee 为 98%。根据实验结果,包括同位素标记和 EPR 研究,我们提出氧化还原活性 Co(0)/Co( II ) 循环参与不对称氢化途径。