Cinchona Alkaloid Amides/Dialkylzinc Catalyzed Enantioselective Desymmetrization of Aziridines with Phosphites
摘要:
The first highly enantioselective desymmetrization of aziridines with phosphites has been developed. Excellent yields and enantio-selectivities were observed for the reaction with various aziridines using a new class of readily accessible chiral catalysts derived from 9-amino-9-deoxy-epi-cinchonas alkaloids. In studies probing the reaction mechanism, we observed some complexes for the cinchona alkaloid amide-Zn(II) by ESI-MS analysis
Enantioselective fluoride ring opening of aziridines enabled by cooperative Lewis acid catalysis
作者:Julia A. Kalow、Abigail G. Doyle
DOI:10.1016/j.tet.2013.01.062
日期:2013.7
The enantioselective ring opening of aziridines using a latent source of HF is described. A combination of two Lewis acids, (salen)Co and an achiral Ti(IV) cocatalyst, provided optimal reactivity and enantioselectivity for the trans beta-fluoroamine product. The use of a chelating aziridine protecting group was crucial. Acyclic and cyclic meso N-picolinamide aziridines underwent fluoride ring opening in up to 84% ee, and the kinetic resolution of a piperidine-derived aziridine was performed with k(rel)=6.6. The picolinamide group may be readily removed without epimerization of the fluoroamine. Preliminary studies revealed a bimetallic mechanism wherein the chiral (salen)Co catalyst delivers the nucleophile and the Ti(IV) cocatalyst activates the aziridine. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis of β-Fluoroamines by Lewis Base Catalyzed Hydrofluorination of Aziridines
作者:Julia A. Kalow、Dana E. Schmitt、Abigail G. Doyle
DOI:10.1021/jo300433a
日期:2012.4.20
Lewis base catalysis promotes the in situ generation of amine-HF reagents from benzoyl fluoride and a non-nucleophilic alcohol. The hydrofluorination of aziridines to provide beta-fluoroamines using this latent HF source is described. This protocol displays a broad scope with respect to aziridine substitution and N-protecting groups. Examples of regio- and diastereoselective ring opening to access medicinally relevant beta-fluoroamine building blocks are presented.
US7799934B2
申请人:——
公开号:US7799934B2
公开(公告)日:2010-09-21
[EN] ANTI-OSTEOARTHRITIS COMPOUNDS AND RELATED COMPOSITIONS AND METHODS<br/>[FR] COMPOSÉS ANTI-OSTÉOARTHRITE AINSI QUE COMPOSITIONS ET MÉTHODES ASSOCIÉES
申请人:AVIDENCE THERAPEUTICS INC
公开号:WO2021011720A2
公开(公告)日:2021-01-21
This invention provides two genuses of novel compounds. Compounds in each genus inhibit both aggrecanase 1 (Adamts4) and aggrecanase 2 (Adamts5). This invention also provides related compositions and methods for treating inflammatory diseases, diseases involving degradation of cartilage, and diseases involving the disruption of cartilage homeostasis.
Enantioselective ring-opening of aziridines
申请人:Antilla Jon C.
公开号:US20090030212A1
公开(公告)日:2009-01-29
A process for the preparation of a nucleophilic addition product of an aziridine and a nucleophile, the process comprising treating the arizidine with the nucleophile in the presence of a biaryl phosphoric acid catalyst