A practical and efficient protocol for Ag/Ru-cocatalyzed regioselective C-H amination of 8-hydroxyquinoline esters with pyrazoles was developed, This reaction proceeded smoothly via a photoredox-mediated direct C-H/N-H oxidative coupling process. The remarkable features of this reaction include the wide substrate scope, mild reaction conditions and high regioselectivity at the C4 site of the quinolinyl
Direct C4–H phosphonation of 8-hydroxyquinoline derivatives employing photoredox catalysis and silver catalysis
作者:Xiaoxue Su、Fan Yang、Yusheng Wu、Yangjie Wu
DOI:10.1039/c8ob00370j
日期:——
A simple and efficient protocol for the C4–H phosphonation of 8-hydroxyquinoline derivatives was developed under a photoredox/silver(I) cocatalysis system, providing a new approach to phosphonated 8-hydroxyquinoline derivatives. Note that the reaction did not occur at the C5 site, but regioselectively at an unusual C4 site. Moreover, the reaction proceeded smoothly under mild reaction conditions (a
Copper-Mediated<i>ortho</i>-Nitration of (Hetero)Arenecarboxylates
作者:Dmitry Katayev、Kai F. Pfister、Timo Wendling、Lukas J. Gooßen
DOI:10.1002/chem.201403363
日期:2014.8.4
Various (hetero)arenecarboxylic acids were converted to the corresponding Daugulis amides and nitrated selectively in the ortho‐position in the presence of [CuNO3(PPh3)2] and AgNO2 at 50 °C. A microwave‐assisted saponification allows regenerating the carboxylate group within minutes, which may then be removed tracelessly by protodecarboxylation, or substituted by aryl‐ or alkoxy‐groups via decarboxylative
Method of treatment of dopamine-related dysfunction
申请人:——
公开号:US20020132827A1
公开(公告)日:2002-09-19
The present invention relates to the treatment of dopamine-related dysfunction using full D
1
dopamine receptor agonists in an intermittent dosing protocol with a short, but essential, “off-period.” The D
1
agonist concentration is reduced during the “off-period” to obtain a plasma concentration of agonist that suboptimally activates D
1
dopamine receptors for a period of time to prevent induction of tolerance. Specifically, the method comprises the steps of periodically administering to a patient a full D
1
agonist with a half-life of up to about 6 hours at a dose resulting in a first plasma concentration of agonist capable of activating D
1
dopamine receptors to produce a therapeutic effect. The dose is reduced at least once every 24 hours to obtain a second lower plasma concentration of agonist that results in suboptimal activation of D
1
dopamine receptors for a period of time sufficient to prevent induction of tolerance.
Solid-Phase Benzoylation of Phenols and Alcohols in Microwave Reactor: An Ecofriendly Protocol
作者:Suchandra Chakraborty、Ahana Saha、Kaushik Basu、Chandan Saha
DOI:10.1080/00397911.2015.1078899
日期:2015.10.18
Abstract An efficient solid-phase benzoylation of phenols and alcohols was developed under microwave irradiation. A stoichiometric amount of benzoyl chloride was sufficient to carry out the reaction. This benzoylation features short reaction time, good yields, and easy workup procedures. Furthermore, the scope of the reaction was extended to prepare 3,5-dinitrobenzoyl derivatives of alcohols. GRAPHICAL