e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
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
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.
