Recoverable Dendritic Phase-Transfer Catalysts that Contain (+)-Cinchonine-Derived Ammonium Salts
作者:Jordi Rull、José Juan Jara、Rosa M. Sebastián、Adelina Vallribera、Carmen Nájera、Jean-Pierre Majoral、Anne-Marie Caminade
DOI:10.1002/cctc.201600283
日期:2016.6.21
The asymmetric alkylation of a glycinate Schiff base with benzyl bromide is used as a benchmark reaction, and the dendrimeric catalyst that contains an allyl group on the O‐9 hydroxy group of the cinchonine units is the most active. The recovery and reuse of the catalyst are possible for five consecutive runs without loss of activity and with only a slight decrease in enantioselectivity. If other electrophiles
A Convergent Synthesis of (+)-Cryptophycin B, a Potent Antitumor Macrolide from <i>Nostoc</i> sp. Cyanobacteria
作者:Arun K. Ghosh、Alexander Bischoff
DOI:10.1021/ol000058i
日期:2000.6.1
text] An efficient and highly stereoselective synthesis of cryptophycin B (2), a potent cytotoxic agent, is described. The ester-derived titanium-enolate-mediated syn-aldol reaction was employed to generate the stereocenters C(5) and C(6). The route is convergent and provides a convenient access to the synthesis of structural variants of cryptophycin B as well as members of its family.
Substituierte 1-phenyl-oxazoliden-2-one Derivate und ihre Verwendung als Adhäsionsrezeptor-Antagonisten
申请人:MERCK PATENT GmbH
公开号:EP0697408A1
公开(公告)日:1996-02-21
Verbindungen der Formel I
worin R¹ und X die angegebenen Bedeutungen besitzen, deren physiologisch unbedenkliche Salze und/oder Solvate, hemmen die Bindung von Fibrinogen an den entsprechenden Rezeptor und können zur Behandlung von Thrombosen, Osteoporosen, Tumorerkrankungen, Apoplexie, Herzinfarkt, Entzündungen, Arteriosklerose und osteolytischen Erkrankungen eingesetzt werden.
式 I 的化合物
中 R¹ 和 X 的含义,以及它们对人体无害的盐类和/或溶解物,可抑制纤维蛋白原与相应受体的结合,并可用于治疗血栓、骨质疏松症、肿瘤疾病、脑中风、心肌梗塞、炎症、动脉硬化和溶骨性疾病。