Enantioselective Organo-Photocatalysis Mediated by Atropisomeric Thiourea Derivatives
作者:Nandini Vallavoju、Sermadurai Selvakumar、Steffen Jockusch、Mukund P. Sibi、Jayaraman Sivaguru
DOI:10.1002/anie.201310940
日期:2014.5.26
this, organo‐photocatalysts that are based on atropisomericthioureas and display lower excited‐state energies than the reactive substrates have been developed. These photocatalysts were found to be efficient in promoting the [2+2] photocycloaddition of 4‐alkenyl‐substituted coumarins, which led to the corresponding products with high enantioselectivity (77–96 % ee) at low catalyst loading (1–10 mol %)
The instant invention provides compounds of Formula I which are leukotriene biosynthesis inhibitors.
Compounds of Formula I are useful as anti-atherosclerotic, anti-asthmatic, anti-allergic, anti-inflammatory and cytoprotective agents.
Bis (biaryl) compounds as inhibitors of leukotriene biosynthesis
申请人:Merck Frosst Canada, Inc.
公开号:US05576338A1
公开(公告)日:1996-11-19
Compounds having the Formula I: ##STR1## are inhibitors of leukotriene biosynthesis. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory, and cytoprotective agents. They are also useful in treating angina, cerebral spasm, glomerular nephritis, hepatitis, endotoxemia, uveitis, and allograft rejection and in preventing the formation of atherosclerotic plaques.
Heteroaryl cinnamic acids as inhibitors of leukotriene biosynthesis
申请人:Merck Frosst Canada, Inc.
公开号:US05360815A1
公开(公告)日:1994-11-01
Compounds having the formula I: ##STR1## are inhibitors of leukotriene biosynthesis. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory, and cytoprotective agents. They are also useful in treating angina, cerebral spasm, glomerular nephritis, hepatitis, endotoxemia, uveitis, and allograft rejection and in preventing the formation of atherosclerotic plaques.
Evaluating Thiourea Architecture for Intramolecular [2+2] Photocycloaddition of 4-Alkenylcoumarins
作者:Nandini Vallavoju、Sermadurai Selvakumar、Steffen Jockusch、Manoj Thathamkulam Prabhakaran、Mukund P. Sibi、Jayaraman Sivaguru
DOI:10.1002/adsc.201400677
日期:2014.9.15
The efficiency of [2+2] photocycloadditions of 4‐alkenylcoumarins was evaluated with various thiourea skeletons to develop thiourea‐based catalysts for promoting photochemical reactions. Our results indicate that the excited state chemistry is dependent on the nature of the thiourea catalyst employed to activate the photoactive substrate.