Practical Asymmetric Synthesis of an Endothelin Receptor Antagonist
摘要:
An efficient, practical, asymmetric synthesis of the endothelin receptor antagonist 1 is reported. The key pyridine-fused cyclopentane ring bearing three consecutive chiral centers was constructed by first an auxiliary induced asymmetric conjugate addition of the bottom aryllithium from 19 to an unsaturated ester 21 in high diastereoselectivity. After a highly diastereoselective addition of the top aryl Grignard reagent to the aldehyde 22, the alcohol product then underwent a stereospecific intramolecular alkylation of the ester enolate by the phosphate of the alcohol, resulting in the desired trans-trans relative stereochemistry on the cyclopentane ring. The two key chiral centers that set the chirality of the molecule were both induced from cis-1-amino-2-indanol-derived chiral auxiliaries, one in the conjugate addition reaction, the other in setting the chiral center of the bottom side chain via chiral alkylation of an enolate. Oxidation of the primary alcohol to the carboxylic acid in the bottom side chain was carried out with the newly developed TEMPO/bleach-catalyzed oxidation by sodium chlorite (NaClO2) or chromium oxide catalyzed oxidation by periodic acid. The overall process has been run successfully to make multikilograms of the drug in high purity.
Asymmetric Conjugate Addition of Ketones to β-Nitrostyrenes by Means of 1,2-Amino-Alcohol-Derived Prolinamides as Bifunctional Catalysts
作者:Diana Almaşi、Diego A. Alonso、Enrique Gómez-Bengoa、Yvonne Nagel、Carmen Nájera
DOI:10.1002/ejoc.200700031
日期:2007.5
This work has been supported by the Direccion General de Investigacion of the Ministerio de Educacion y Ciencia (CTQ2004-00808/BQU), by the Generalitat Valenciana (CTIOIB/2002/320, GRUPOS03/134, GRUPOS05/11 and GV05/157) and the University of Alicante.
这项工作得到了教育部长和 Ciencia 的 Direccion General de Investigacion (CTQ2004-00808/BQU)、Generalitat Valenciana (CTIOIB/2002/320、GRUPOS03/134、GRUPOS05/11 和 GV05) 和 GV05/阿利坎特大学。
Chemo‐ and Regioselective Ring Construction Driven by Visible‐Light Photoredox Catalysis: an Access to Fluoroalkylated Oxazolidines Featuring an All‐Substituted Carbon Stereocenter
ether, fluoroalkyl halide, and chiral amino alcohol in a single reaction vessel, which provides an efficient strategy for expanding the pool of pharmaceutically important heterocycles featuring an all‐substituted carbon stereocenter. This process proceeds efficiently in a chemo‐, regio‐, and stereoselective fashion under mild reaction conditions at room temperature and exhibits broad functional group
Practical Asymmetric Synthesis of a Selective Endothelin A Receptor (ETA) Antagonist
作者:Zhiguo J. Song、Matthew Zhao、Lisa Frey、Jing Li、Lushi Tan、Cheng Y. Chen、David M. Tschaen、Richard Tillyer、Edward J. J. Grabowski、Ralph Volante、Paul J. Reider、Yoshiaki Kato、Shigemitsu Okada、Takayuki Nemoto、Hiroki Sato、Atsushi Akao、Toshiaki Mase
DOI:10.1021/ol016601s
日期:2001.10.1
[structure: see text]. A practical, chromotography-free asymmetric synthesis was developed for the large scale preparation of an endothelinreceptorantagonist 2. This synthesis includes a new efficient process for the preparation of 6-bromo-2,3-dihydrobenzofuran, a stereoselective conjugate addition of an aryllithium followed by stereospecific addition of the Grignard reagent of the top aryl bromide
[EN] DPP-IV INHIBITORS<br/>[FR] INHIBITEURS DE LA DPP-IV
申请人:GRAFFINITY PHARMACEUTICALS AG
公开号:WO2005095343A1
公开(公告)日:2005-10-13
The invention relates to compounds of formula (I), Z-C(R<1>R<2>)-C(R<3>NH2)-C(R<4>R<5>)-X-N(R<6>R<7>), wherein Z, R<1-7> and X have the meaning as cited in the description and the claims. Said compounds are useful as DPP-lV inhibitors. The invention also relates to the preparation of such compounds as well as the production and use thereof as medicament.
Asymmetric transfer hydrogenation of ketones using amino alcohol and monotosylated diamine derivatives of indane
作者:Matthew J. Palmer、Jennifer A. Kenny、Tim Walsgrove、Aparecida M. Kawamoto、Martin Wills
DOI:10.1039/b108538g
日期:2002.1.23
A series of 1,2-amino alcohol and 1,2-monotosylated diamine derivatives of indane have been applied as ligands in the asymmetric ruthenium(II)-catalysed transfer hydrogenation reaction of a series of ketones. Of these, the cis-1-aminoindan-2-ol derivative gives some of the highest asymmetric inductions reported for any amino alcohol ligand in this application.