A DOMINO REACTION FOR THE SYNTHESIS OF 2<i>H</i>-PYRANO[4'',3'',2'':4',5']CHROMENO[2',3':4,5]THIENO[2,3-<i>b</i>]PYRIDIN-2-ONES
DOI:
https://doi.org/10.1007/3139Keywords:
4-chloromethylcoumarin, 4-(3-cyanopyridin-2-ylsulfanylmethyl)coumarin, pyrano[4'', 3'', 2'', 4', 5']chromeno[2', 3', 4, 5]thieno[2, 3-b]pyridine, domino reaction, intramolecular cyclizationAbstract
2-{[(5-Hydroxy-2-oxo-2H-chromen-4-yl)methyl]sulfanyl}pyridine-3-carbonitrile derivatives were synthesized in a reaction of 4-chloromethyl-5-hydroxycoumarin with substituted 2-thioxopyridine-3-carbonitriles. The presence in the molecule of spatially adjacent active methylene, nitrile, and hydroxyl groups under the action of a base leads to consecutive intramolecular cyclization reactions with the formation of a novel heterocyclic system pyrano[4'',3'',2'':4',5']chromeno[2',3':4,5]thieno[2,3-b]pyridine.
Authors: Svitlana P. Bondarenko, Igor V. Zhytnetskyi, Serhii V. Semenov, Mykhaylo S. Frasinyuk*