Mandelic acids represent a key structural motif present in many drug molecules. Herein, we report the controlled meta-selective mono- and diolefination of mandelic acids by the careful design of the substrate and oxidant. Furthermore, free meta-functionalized mandelic acid was generated by selectively removing the template under mild basic conditions. The synthesis of functionalized homatropine and
Palladium‐Catalyzed Directed
<i>meta</i>
‐Selective C−H Allylation of Arenes: Unactivated Internal Olefins as Allyl Surrogates
作者:Tapas Kumar Achar、Xinglong Zhang、Rahul Mondal、M. S. Shanavas、Siddhartha Maiti、Sabyasachi Maity、Nityananda Pal、Robert S. Paton、Debabrata Maiti
DOI:10.1002/anie.201904608
日期:2019.7.22
Palladium(II)‐catalyzed meta‐selective C−H allylation of arenes has been developed utilizing synthetically inert unactivated acyclic internal olefins as allylic surrogates. The strong σ‐donating and π‐accepting ability of pyrimidine‐based directing group facilitates the olefin insertion by overcoming inertness of the typical unactivated internal olefins. Exclusive allyl over styrenyl product selectivity
Arenes containing conformationally flexible long alkyl chains have been successfully functionalized at the meta‐position. Good to excellent metaselectivity is achieved for systems with up to 20 atoms between the target C−H bond and the coordinating heteroatom of the directing group. The palladium‐catalyzed functionalization reactions include alkylation, cyanation, olefination, and acetoxylation. The
[EN] DERIVATIVES OF 6-SUBSTITUTED TRIAZOLOPYRIDAZINES AS REV-ERB AGONISTS<br/>[FR] DÉRIVÉS DE TRIAZOLOPYRIDAZINES 6-SUBSTITUÉES EN TANT QU'AGONISTES DE REV-ERB
申请人:GENFIT
公开号:WO2013045519A1
公开(公告)日:2013-04-04
The present invention provides novel 6-substituted [1,2,4]triazolo[4,3-b]pyridazines that are agonists of Rev-Erb. These compounds, and pharmaceutical compositions comprising the same, are suitable means for treating any disease wherein the activation of Rev-Erb has therapeutic effects, for instance in inflammatory and circadian rhythm-related disorders or cardiometabolic diseases.
Photoinduced Regioselective Olefination of Arenes at Proximal and Distal Sites
作者:Argha Saha、Srimanta Guin、Wajid Ali、Trisha Bhattacharya、Sheuli Sasmal、Nupur Goswami、Gaurav Prakash、Soumya Kumar Sinha、Hediyala B. Chandrashekar、Sanjib Panda、S. S. Anjana、Debabrata Maiti
DOI:10.1021/jacs.1c12311
日期:2022.2.2
regioselectivity. Often, the high thermal energy required to promote olefination leads to multiple site functionalizations. To this aim, we established a photoredox catalytic system constituting a merger of palladium/organo-photocatalyst (PC) that forges oxidative olefination in an explicit regioselective fashion with diverse arenes and heteroarenes. Visible light plays a significant role in executing “regioresolved”