A novel enantioselective protonation protocol that is triggered by reductive cross coupling of olefins is reported. When under cooperative photoredox and chiral hydrogen-bonding catalytic conditions and using a terminal reductant, various α-branched vinylketones with diverse vinylazaarenes could provide important enantioenriched azaarene derivatives containing tertiary stereocenters at their remote
[EN] PHARMACEUTICALLY ACTIVE PYRAZOLO-TRIAZINE AND/OR PYRAZOLO-PYRIMIDINE DERIVATIVES<br/>[FR] DÉRIVÉS DE PYRAZOLOTRIAZINE ET/OU DE PYRAZOLOPYRIMIDINE PHARMACEUTIQUEMENT ACTIFS
申请人:QURIENT CO LTD
公开号:WO2019197546A1
公开(公告)日:2019-10-17
The present invention relates to pyrazolo [1,5 -a] [1,3,5 ]triazine and pyrazolo[1,5-a] pyrimidine derivatives and/or pharmaceutically acceptable salts thereof, the use of these derivatives as pharmaceutically active agents, especially for the prophylaxis and/or treatment of cell proliferative diseases, inflammatory diseases, immunological diseases, cardiovascular diseases and infectious diseases. Furthermore, the present invention is directed towards pharmaceutical compositions containing at least one of the pyrazo lo [1,5-a][1,3,5 ]triazine and pyrazolo [1,5-a]pyrimidine derivatives and/or pharmaceutically acceptable salts thereof.
A novel regio- and stereoselective reductive coupling of vinyl azaarenes and alkynes has been developed to access functionalized azaarene compounds bearing stereodefined tri-substituted alkenes via photoredox cobalt dualcatalysis. Simple organic base together with alcohol has been applied as the hydrogen sources instead of commonly used Hantzsch esters in this coupling reaction.
The development of catalytic asymmetric radical reactions is an attractive but formidable task. The high reactivity of radicals enables the use of readily accessible feedstocks and mild reaction conditions, but it leads to substantial difficulty for chiral catalysts to provide sufficient enantiocontrol. Moreover, a racemic background process is often inevitable, further deteriorating enantioselectivity