Synthesis and Diels–Alder Cycloadditions of <i>exo</i>-Imidazolidin-2-one Dienes
作者:Rafael Bautista、Pablo Bernal、Rafael Herrera、Blanca M. Santoyo、J. Miguel Lazcano-Seres、Francisco Delgado、Joaquín Tamariz
DOI:10.1021/jo201335y
日期:2011.10.7
An efficient and versatile synthesis of novel exo-imidazolidin-2-one dienes is described. This involves the base-assisted condensation/cyclization cascade reaction of the monoimino derivatives of diacetyl with a series of isocyanates. This methodology enables preparation of symmetrical dienes, as long as the substrates have the same N substituent. Moreover, use of different N-substituted starting materials