Tetrahedron letters

Pyrrole and pyridine derivatives via 1, 7-cyclization of butenynyl nitrones the product-determining influence of substituents on the deactivation pathway of the oxaza- …

W Eberbach, J Roser

Index: Eberbach, Wolfgang; Roser, Joachim Tetrahedron Letters, 1987 ,  vol. 28,  # 24  p. 2689 - 2692

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Citation Number: 16

Abstract

Abstract A remarkable substituent effect is described for the thermal transformation of three butenynyl nitrones into pyrrole and pyridine derivatives. The results are best explained by assuming oxaza-cycloallenes, cyclopropenes, and, most importantly, carbonyl carbenes as intermediates.