Reversible cyclization of N??(3??hydroxy??1??alkenyl) pyridinium salts to pyridooxazines

…, G Casini, M Ferappi, GM Cingolani

Index: Carotti, A.; Casini, G.; Ferappi, M.; Cingolani, G. M. Journal of Heterocyclic Chemistry, 1980 , vol. 17, # 6 p. 1577 - 1584

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Citation Number: 9

Abstract

Abstract Partially hydrogenated pyrido [2, 1-b][1, 3] oxazine, cyclopenta [d] pyrido [2, 1-b][1, 3] oxazine and pyrido [1, 2-a]-[3, 1] benzoxazine ring systems were easily formed in the reaction of 3-hydroxy-2-(2-hydroxy-1, 3-dioxo-2-indanyl)-2-alken-1-one derivatives with tosyl chloride and pyridine bases. A facile interconversion between pyridooxazines and the corresponding pyridinium salts was also realized.