Pn. Devine et al., FACTORS INFLUENCING THE STEREOSELECTIVITY IN THE CYCLOADDITION OF IMINO-DIENOPHILES DERIVED FROM AMINO ETHERS, AMINO-ALCOHOLS, AND AMINO-ACID ESTERS, Tetrahedron letters, 34(37), 1993, pp. 5827-5830
Imino dienophiles derived from amino ethers, amino alcohols and amino
esters undergo Lewis acid promoted cycloaddition with Danishefsky's di
ene. Cyclic chelation between the imine and oxygen atom increases the
stereoselectivity of the reaction.