Lm. Harwood et Ia. Lilley, SYNTHESIS OF CARBOXYLATED PYRROLIDINE DERIVATIVES VIA 1,3-DIPOLAR CYCLOADDITIONS OF HOMOCHIRAL DOUBLE-STABILIZED E-AZOMETHINE YLIDS, Tetrahedron : asymmetry, 6(7), 1995, pp. 1557-1560
The preparation and subsequent diastereoselective 1,3- dipolar cycload
dition of E-carboethoxy-substituted azomethine ylids derived by conden
sing 5-(S)-phenylmorpholinone (1) with ethyl glyoxalate is described.
Removal of the chiral template furnishes enantiomerically pure pyrroli
dine-2,5-dicarboxylate derivatives.