A. Hui et al., ALDOL EQUILIBRATIONS OF UNPROTECTED TRIHYDROXYBICYCLIC LACTONES - ENANTIOMERIC TETRAHYDROXY-ALPHA-AMINOCYCLOPENTANE CARBOXYLIC-ACIDS FROM EPIMERIC BICYCLIC LACTONES, Tetrahedron letters, 35(47), 1994, pp. 8895-8898
Six stereoisomers - including an enantiomeric pair - of no-2,3,4,5-tet
rahydroxy-cyclopentane-1-carboxylate have been prepared from a single
azidolactone starting material by a series of remarkable aldol equilib
rations.