Synthesis of <i>exo</i>-Imidazolidin-2-one Dienes, Their Isomerization, and Selectivity in Diels–Alder Cycloadditions
作者:Carlos Espinoza-Hicks、Pablo Montoya、Rafael Bautista、Hugo A. Jiménez-Vázquez、Luz M. Rodríguez-Valdez、Alejandro A. Camacho-Dávila、Fernando P. Cossío、Francisco Delgado、Joaquín Tamariz
DOI:10.1021/acs.joc.7b02344
日期:2018.5.18
condensation reaction was carried out with bis-imino derivatives, diacetyl, and triphosgene, affording symmetrically N,N-disubstituted dienes. The use of alkyl methyl α-diketones led to the formation of nonsymmetrical dienes, which underwent isomerization to provide more stable inner-outer-ring dienes under Lewisacid conditions. Evaluation was made of the reactivity as well as regio- and stereoselectivity