Selective α-amination and α-acylation of esters and amides via dual reactivity of O-acylhydroxylamines toward zinc enolates
作者:Stacey L. McDonald、Qiu Wang
DOI:10.1039/c3cc49296f
日期:——
Selective alpha-amination and alpha-acylation of esters and amides have been developed, employing O-acylhydroxylamines as a dually reactive aminating and acylating reagent. Treatment of zinc enolates with O-acylhydroxylamines provides solely 1,3-dicarbonyl compounds under mild conditions. Introduction of a copper catalyst into the system shifts the reactivity entirely, yielding alpha-amination products
The present invention provides compounds of formula (I):
compositions comprising such compounds; the use of such compounds in therapy (such as asthma or COPD); and methods of treating patients with such compounds; wherein R
1
-R
11
are as defined herein.
Heterocyclic molecules for biomedical imaging and therapeutic applications
申请人:Washington University
公开号:US10335504B2
公开(公告)日:2019-07-02
Probes which target diffuse and fibrillar forms of amyloid beta (Aβ) are described. These probes demonstrate high initial brain penetration and facile clearance from non-targeted regions. The agents can be used to image amyloid quantitatively for monitoring efficacy of Aβ-modifying therapeutics and assist in premortem diagnosis of Alzheimer's disease (AD). Disclosed probes can bind Aβ aggregates of preformed Aβ1-42 fibrils in vitro and can be used to image fibrillar and diffuse plaques ex vivo in brain sections. Disclosed probes can be used to determine Aβ burden in early stages of AD. These probes can be used for multimodality imaging of Aβ. F-AI-187 (1 μM) can detect Aβ plaques in brain sections of APP/PS1 mice. F-AI-187 (10 μM) can detect Aβ plaques in the frontal lobe in a brain section of a patient with confirmed AD. Some probes can be used for fluorescence imaging of plaque.
The present invention provides compounds of formula (I): compositions comprising such compounds; the use of such compounds in therapy (such as asthma or COPD); and methods of treating patients with such compounds; wherein R1 - R11 are as defined herein.