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

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 Paul^a and   Yong Rok Lee*^a  

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^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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