Seven derivatives of methyl 5-phenyl-3, 4-dihydro-2 H-pyrrole-2-carboxylates 1 were synthetized. These compounds are precursors of pentagonal cyclic azomethine ylids, the two sides of which are diastereotopic. The 1, 3-dipolar species react with N-methyl and N- phenylmaleimides diastereospecifically. The approach of the reactant species occurs from the less hindered side of the 1, 3-dipole and in endo to lead the thermodynamically stable ...
