Nonclassical heterocycles. 6. Tri-and tetracyclic ring systems containing a" nonclassical" thiophene nucleus

…, HP Youzwak, SJ Zurawel Jr

Index: Potts, Kevin T.; Youzwak, Henry P.; Zurawel, Stanley J. Journal of Organic Chemistry, 1980 , vol. 45, # 1 p. 90 - 97

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Citation Number: 18

Abstract

The in situ generation of azomethine imine ylides from 1-aminopyridinium, 1- aminoquinolinium, and 2-aminoisoquinolinium salts and their subsequent cycloaddition to dibenzoylacetylene has been utilized as a route to a series of 2, 3-dibenzoylpyrazolo [1, 5-a] pyridines, to 2, 3-dibenzoylpyrazolo [1, 5-a] quinoline, and to 1, 2-di-benzoylpyrazolo [5, 1-a] isoquinoline, respectively. Treatment of these dibenzoyl heterocycles with P4Slo/. pyridine ...