Diastereofacial selectivity in Diels-Alder reactions of chiral 2-substituted-1,3-dienes.
作者:Robert Bloch、Nathalie Chaptal-Gradoz
DOI:10.1016/s0040-4039(00)60028-x
日期:1992.10
described. Thermal Diels-Alderreactions between these dienols or their ethers 3 and various dienophiles give rise with fair to good regio- and diastereoselectivity to monocyclic “para” adducts. In contrast a total regioselectivity and an excellent π-facial selectivity is observed when the Diels-Alder cycloadditions of the dienic ethers 3 are conducted in the presence of a Lewis acid.