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Monday, 21 March 2016

Eco-friendly construction of highly functionalized chromenopyridinones by an organocatalyzed solid-state melt reaction and their optical properties


Green Chem., 2016, 18,1488-1494
DOI: 10.1039/C5GC02658J, Paper
Sanjay Paul, Yong Rok Lee
Diverse chromenopyridinone derivatives were synthesized under organocatalytic solid-state melt conditions. The optical properties of these [small pi]-expanded chromenopyridine derivatives were examined.
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http://pubs.rsc.org/en/Content/ArticleLanding/2016/GC/C5GC02658J?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract

Eco-friendly construction of highly functionalized chromenopyridinones by an organocatalyzed solid-state melt reaction and their optical properties

Sanjay Paula and   Yong Rok Lee*a  
*
Corresponding authors
a
School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea
E-mail: yrlee@yu.ac.kr
Fax: +82-53-810-4631
Tel: +82-53-810-2529
Green Chem., 2016,18, 1488-1494

DOI: 10.1039/C5GC02658J


















The library construction of highly functionalized and diverse chromenopyridinones was achieved by three-component reactions of various 4-hydroxycoumarins with ammonium acetate and 3-formylchromones under L-proline catalyzed solid-state melt conditions. The advantages of this protocol include the use of an inexpensive organocatalyst, avoidance of toxic organic solvents, environmentally benign conditions, an easy work-up procedure and good to excellent product yields. The optical properties of these π-expanded varieties of the synthesized chromenopyridinone derivatives were also examined. A chromeno[4,3-b]pyridine nucleus bearing an electron donating group exhibited strong emission in the blue-green region of the visible spectrum.









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Saturday, 12 March 2016

High Trans Kinetic Selectivity in Ruthenium-Based Olefin Cross-Metathesis through Stereoretention

Abstract Image.







High Trans Kinetic Selectivity in Ruthenium-Based Olefin Cross-Metathesis through Stereoretention

The Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering. California Institute of Technology, Pasadena, California 91125, United States
Materia, Inc., Pasadena, California 91107, United States
Org. Lett., 2016, 18 (4), pp 772–775
DOI: 10.1021/acs.orglett.6b00031
Publication Date (Web): February 03, 2016
Copyright © 2016 American Chemical Society

 http://pubs.acs.org/doi/abs/10.1021/acs.orglett.6b00031





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