Investigation on the reactivity of isoxazol-5-ones towards 1,2-diaza-1,3-dienes: new entry to variously substituted (imidazol-2-yl)acetate and 1,3-oxazin-6-one derivatives
作者:Orazio A. Attanasi、Silvia Bartoccini、Gianfranco Favi、Gianluca Giorgi、Francesca R. Perrulli、Stefania Santeusanio
DOI:10.1016/j.tet.2011.10.118
日期:2012.1
derivative. The first aza-Michael addition is followed by an intramolecular second, affording a fused heterobicyclic system that, upon ring opening and decarboxylation processes, gives rise to novel substituted imidazoles with an acetate functionality in the 2-position. On the contrary, under the same reaction conditions, 3-phenylisoxazol-5-one provides a double Michael addition at two units of DD involving