Pa. Jacobi et Wj. Zheng, A VERSATILE SYNTHESIS OF BETA-AMINO ACIDS USING THE NICHOLAS REACTION.2. FORMAL TOTAL SYNTHESIS OF THIENAMYCIN, Tetrahedron letters, 34(16), 1993, pp. 2585-2588
Homochiral acetylenic acid 26, prepared using the Schreiber modificati
on of the Nicholas reaction, has been converted to beta-amino acid der
ivative 28 by a two step sequence involving Curtius rearrangement foll
owed by oxidative cleavage of the acetylenic bond. Amino acid derivati
ve 28 was then converted to thienamycin (12) precursor 30 by cyclizati
on with DCC followed by epimerization.