

SYNTHESIS OF SULFOLANOPYRANOCHROMENONES BY THE REACTION OF 2-BENZYLIDENE-3-METHYL-4-NITRO-2,5-DIHYDROTHIOPHENE 1,1-DIOXIDES WITH 4-HYDROXYCOUMARIN

Abstract
A number of tetracyclic compounds with annulated nitrosulfolane and pyranochromenone rings were synthesized by reacting 2-benzylidene-3-methyl-4-nitro-2,5-dihydrothiophene 1,1-dioxides with 4-hydroxycoumarin. Structural features of the resulting polycyclic compounds were established on the basis of IR, 1Н, 13С NMR, 1Н–13С HMQC, 1Н–13С HMBC, NOESY spectroscopy and X-ray structural analysis data.
Authors: Irina E. Efremova*, Igor I. Savelev, Ruslan I. Baichurin, Vladislav V. Gurzhiy
Keywords
2-benzylidene-3-methyl-4-nitro-2,5-dihydrothiophene 1,1-dioxides; enolizable cyclic CH acids; 4-hydroxycoumarin; sulfolenes; domino process
Latvian Institute of Organic Synthesis - Aizkraukles iela, 21, Riga, LV-1006, Latvia - hgs@osi.lv