Pa. Jacobi et Wj. Zheng, A VERSATILE SYNTHESIS OF BETA-AMINO ACIDS USING THE NICHOLAS REACTION.1. APPLICATION TO BETA-LACTAMS OF THE CARBAPENEM CLASS, Tetrahedron letters, 34(16), 1993, pp. 2581-2584
Homochiral acetylenic acids of general structure 10, prepared using th
e Schreiber modification of the Nicholas reaction, have been converted
to beta-amino acid derivatives of type 11 by a two step sequence invo
lving Curtius rearrangement followed by oxidative cleavage of the acet
ylenic bond. Amino acid derivatives 11 are excellent precursors for be
ta-lactams of the carbapenem class.