THE ASYMMETRIC-SYNTHESIS OF BETA-LACTAMS - STEREOCONTROLLED ASYMMETRIC TANDEM MICHAEL ADDITIONS AND ALKYLATIONS OF ALPHA,BETA-UNSATURATED ACYL LIGANDS BOUND TO THE CHIRAL AUXILIARY [BETA-C5H5)FE(CO)(PPH3)] - Davies, S; Dordorhedgecock, I; Sutton, K; Walker, J (TETRAHEDRON LETTERS, 1986)