Functionalized Cyclobutenes via Multicomponent Thermal [2 + 2] Cycloaddition Reactions
作者:Helen M. Sheldrake、Timothy W. Wallace、Craig P. Wilson
DOI:10.1021/ol051675f
日期:2005.9.1
[reaction: see text] Enamine [2 + 2] cycloadditions can be achieved in useful yields simply by stirring a mixture of an aldehyde, diethylamine, a dialkyl fumarate, and potassium carbonate in acetonitrile at 25 degrees C, conditions that are compatible with the presence of a potential leaving group on the beta-position of the intermediate enamine. Methylation and elimination of the product cyclobutanes