M. Jurczak et al., Diastereoselection in 1,3-dipolar cycloadditions of a chiral cyclic nitrone to alpha,beta-unsaturated delta-lactones, TETRAHEDR-A, 11(9), 2000, pp. 2015-2022
1,3-Dipolar cycloadditions of the nitrone 1 to alpha,beta-unsaturated delta
-lactones: non-chiral 13, racemic mixture 3/4, D-glycero 3, and L-glycero 4
proceed with high stereoselectivity in the cases of 13 and 3 and a signifi
cant kinetic resolution in the case of the racemate 3/4. The exo approach t
o the re-re sides of the lactones predominates. (C) 2000 Elsevier Science L
td. All rights reserved.