A novel pentacyclic pyridine dilactone. 7??methyl [1] benzopyrano [4, 3??d][1] benzoxacino [4, 3??b] pyridine??6, 16??dione

K Rajyalakshmi, VR Srinivasan

Index: Rajyalakshmi, K.; Srinivasan, V. R. Journal of Heterocyclic Chemistry, 1980 , vol. 17, p. 1737 - 1739

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Citation Number: 3

Abstract

Abstract When equimolar quantities of salicylaldehyde 2 and ethyl 3-amino-2-butenoate 3 or its constituents (ethyl 3-oxobutanoate and ammonia) were refluxed on a steam-bath for 6 hours with a trace of acetic acid, two products, a pentacyclic pyridine dilactone 4 and 3- acetyl coumarin 5, resulted in 15% and 45% yields, respectively. The structure of 4 was elucidated as 7-methyl [1] benzopyrano [4, 3-d][1] benzoxacino [4, 3-b]-pyridine-6, 16- ...