Synthesis of new pyrano[3,2-c]chromenes

¹ Kuban State University, 149 Stavropolskaya Str., Krasnodar 350040, Russian Federation
² ChemEx Lab, Vladimir Dal’ Lugansk National University, Lugansk, 91034 Russia.
³ North-Caucasus Federal University, 1 Pushkina St., 355009 Stavropol, Russian Federation
⁴ Kuban State Technological University, 2 Moskovskaya st., 350072 Krasnodar, Russian Federation
⁵ All-Russian Research Institute of Biological Plant Protection, Laboratory of plant growth regulators, 350039 Krasnodar, Russian Federation

Published: 03 November 2017 by MDPI in The 21st International Electronic Conference on Synthetic Organic Chemistry session General Organic Synthesis

https://doi.org/10.3390/ecsoc-21-04804

Abstract:

The reaction of 4-hydroxy-7,7-dimethyl-7,8-dihydro-6H-chromen-2,5-dione with aldehydes and malononitrile afforded new pyrano[3,2-c]chromenes. Upon treatment of 4-hydroxy-7,7-dimethyl-7,8-dihydro-6H-chromen-2,5-dione with anilines and triethyl orthoformate, new 3-anilinomethylidene 7,8-dihydro-2H-chromen-2,4,5(3H,6H)-triones were synthesized.

Keywords: malonyl heterocycles, Meldrum's acid, dimedone, 4-hydroxy-7,7-dimethyl-7,8-dihydro-6H-chromen-2,5-dione, pyrano[3,2-c]chromenes

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