Asymmetric synthesis of homoproline derivatives via Rh(I)-catalyzed hydrogenation using chiral bisphosphines as ligands
摘要:
It has been demonstrated for the first time that Rh(I)-catalyzed asymmetric hydrogenation of cyclic beta-enamino acid derivatives I using chiral bisphosphines could be a highly efficient synthetic method for optically active homoproline derivatives. The enantioselectivity and conversion yield were largely dependent upon the chiral ligand. Using the Me-BDPMI forming a seven-membered metal chelate, the N-acetylated beta-enamino acid methyl ester la was hydrogenated to give optically active homoproline derivative 2a with 100% conversion and 96% ee. (C) 2004 Elsevier Ltd. All rights reserved.
N-acylpyrrolidin-2-ylalkylbenzamidine derivatives as inhibitors of factor Xa
申请人:——
公开号:US20030092698A1
公开(公告)日:2003-05-15
This invention is directed to N-acylpyrrolidin-2-ylalkylbenzamidine derivatives which useful for inhibiting the activity of Factor Xa, by contacting said derivatives with a composition containing Factor Xa. The present invention is also directed to compositions containing said derivatives, methods for their preparation, their use, such as in inhibiting the formation of thrombin or for treating a patient suffering from, or subject to, a disease state associated with a physiologically detrimental excess amount of thrombin.
Aminosäuren 9. Mitt. Stereospezifische Synthese von heterocyclisch substitutierten Dehydroaminosäurederivaten
作者:Claus Herdeis、Jyrki Syväri
DOI:10.1002/ardp.19883210813
日期:——
Eine stereospezifische Synthesemethode zur Darstellung chiral und achiral substituierter E‐ bzw. Z‐konfigurierter α‐Dehydroaminosäurederivate wird beschrieben. Einige der synthetisierten Verbindungen zeigen positiv inotrope Wirkung am Meerschweinchenherzen.
pyrrolidone were investigated. The generalization of our preliminary findings on a copper(I)-catalyzed Csp2-N coupling process was first improved with a wide variety of aryl and heteroaryl halides and methyl pyroglutamate. The optimized protocol was further extended to pyrrolidin-2-ones substituted at the C5-position with an aryl group bearing an electron-donating or electron-withdrawing group as well as
Aza- and carbo-[3+3] annulations of exo-cyclic vinylogous amides and urethanes. Synthesis of tetrahydroindolizidines and an unexpected formation of hexahydroquinolines
作者:Sunil K. Ghosh、Grant S. Buchanan、Quincy A. Long、Yonggang Wei、Ziyad F. Al-Rashid、Heather M. Sklenicka、Richard P. Hsung
DOI:10.1016/j.tet.2007.09.089
日期:2008.1
Annulations of exo-cyclic vinylogousamides and urethanes with vinyl iminium salts are described here. We observed an intriguing dichotomy in their reaction pathways. For pyrrolidine- and azepane-based vinylogousamides or urethanes, aza-[3+3] annulation would dominate to give tetrahydroindolizidines, whereas, unexpectedly, for piperidine-based vinylogousamides or urethanes, carbo-[3+3] annulation was
A highly diastereoselective three-component coupling reaction has been used in a concise approach to the left-hand side of batzelladine A. The stereoselectivity of this reaction, along with related observations described herein, provides insight into the mechanism of this reaction.