Reported herein is a visible‐light‐mediated radical approach to the α‐alkylation of ketones. This method exploits the ability of a nucleophilic organocatalyst to generate radicals upon SN2‐based activation of alkyl halides and blue light irradiation. The resulting open‐shell intermediates are then intercepted by weakly nucleophilic silyl enol ethers, which would be unable to directly attack the alkyl
A novel reaction of α-haloketone (α-bromo and α-chloro ketone) with irradiation under microwave gave the corresponding α-hydroxyketone and pyrazine derivative in good yields. In the case of α,α′-dibromo ketone, α-diketone was obtained. This reaction affords a new, clean and convenient synthetic method for α-hydroxyketone, α-diketone, α-chloro ketone and pyrazine derivative.
Photochemical α-bromination of ketones using N-bromosuccinimide: a simple, mild and efficient method
作者:Sudhir S. Arbuj、Suresh B. Waghmode、A.V. Ramaswamy
DOI:10.1016/j.tetlet.2006.12.101
日期:2007.2
Aromatic and aliphatic carbonyl compounds undergo facile bromination with N-bromosuccinimide under UV–vis irradiation to give the corresponding α-brominated ketones in good yields, at low temperatures (30 °C), without any catalyst, catalyst support or radical initiator and within a short time.
[EN] THIAZOLOPYRIMIDINONES AS MODULATORS OF NMDA RECEPTOR ACTIVITY<br/>[FR] THIAZOLOPYRIMIDINONES EN TANT QUE MODULATEURS DE L'ACTIVITÉ DU RÉCEPTEUR NMDA
申请人:HOFFMANN LA ROCHE
公开号:WO2015052226A1
公开(公告)日:2015-04-16
The present invention relates to certain thiazolopyrimidinone compounds for use in modulating NMDA receptor activity, pharmaceutical compositions comprising such compounds and methods of treating neurological and psychiatric conditions.
A synthetic strategy featuring efficient ruthenium-catalyzed asymmetric hydrogenation of racemic α-aryloxy cyclic ketone via dynamic kinetic resolution and palladium-catalyzed intramolecularreductive Heck cyclization has been developed for the asymmetric total synthesis of (−)-galanthamine (20.1%, 12 steps) and (−)-lycoramine (40.2%, 10 steps)