PROCESS FOR THE PREPARATION OF A GLUCOKINASE ACTIVATOR COMPOUND
申请人:Bachmann Stephan
公开号:US20110054174A1
公开(公告)日:2011-03-03
The present invention relates to a process for the preparation of a compound of formula I,
wherein R
1
is C
1-6
-alkyl and R
2
is hydrogen or halogen.
(R)-2-phenyl propionic acid derivatives of formula I are key intermediates in the synthesis of 5-substituted-pyrazine or pyridine glucokinase activators of the formula Xa,
which have the potential to be useful for the treatment and/or prophylaxis of type II diabetes.
functionalized tricyclic intermediate was prepared with excellent enantiopurity by using Carreira polyene cyclization. An unusual anionic Diels-Alder reaction was responsible for the construction of the bicyclo[2.2.2]octane. The α-methyl ketone was furnished by iridium-catalyzed allylic alcohol isomerization. Sanford Csp3-H oxidation was exploited to install the secondary hydroxygroup of 2. The oxazolidinopiperidine
Intramolecular Hydrogen-Bonding Effects on the Fluorescence of PRODAN Derivatives
作者:Isaac G. Alty、Douglas W. Cheek、Tao Chen、David B. Smith、Emma Q. Walhout、Christopher J. Abelt
DOI:10.1021/acs.jpca.6b02398
日期:2016.5.26
This behavior is attributed to decreased efficiency in intersystemcrossing due to an increase in the energy of the n → π* triplet state. The intramolecular H bond does not induce quenching in acetonitrile; however, in the presence of a very small concentration of methanol, a dual intramolecular, intermolecular H-bonding arrangement does lead to partial quenching as revealed by preferential solvation