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.
This invention relates to a key intermediate in the synthesis of an endothelin antagonist the synthesis of this key intermediate via an asymmetric conjugate addition reaction.
这项发明涉及一种内皮素拮抗剂合成中的关键中间体,通过不对称共轭加成反应合成这种关键中间体。
[EN] STEREOSELECTIVE DEOXYGENATION REACTION<br/>[FR] REACTION DE DESOXYGENATION STEREOSELECTIVE
申请人:MERCK & CO., INC.
公开号:WO1998006700A1
公开(公告)日:1998-02-19
(EN) This invention relates to a key intermediate in the synthesis of an endothelin antagonist, the synthesis of this key intermediate and the synthesis of an endothelin antagonist using this intermediate in a stereoselective deoxygenation reaction.(FR) L'invention concerne un intermédiaire clé dans la synthèse d'un antagoniste de l'endothéline, la synthèse dudit intermédiaire clé et la synthèse d'un antagoniste de l'endothéline réalisées par l'emploi dudit intermédiaire dans une réaction de désoxygénation stéréosélective.