Tetrahedron Letters

A study of the reactions of 2-aryl-4-hydroxy-6H-1, 3-thiazin-6-ones with chromone-3-carboxaldehydes

RV Shutov, EV Kuklina, BA Ivin

Index: Shutov, Roman V.; Kuklina, Elizaveta V.; Ivin, Boris A. Tetrahedron Letters, 2011 , vol. 52, # 2 p. 266 - 269

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Citation Number: 6

Abstract

Reaction of 3-formylchromones with 2-aryl-4-hydroxy-6H-1, 3-thiazin-6-ones in the presence of pyridine leads to formation of a mixture of novel N-thioaroyl-5-hydroxy-2H, 5H-pyrano [3, 2- с] chromen-2-one-3-carboxamides and 2-aryl-5-(4′-oxochromen-3′-yl)-6, 7-dihydro-4H, 5H-pyrano [2, 3-d][1, 3] thiazine-4, 7-diones. The yields of these compounds clearly depend on the nature of the substituent on the 3-formylchromone and on the reaction conditions.