ChemInform Abstract: A Novel Dieckmann‐Type Cyclization, the Final Step of the Synthesis of a Carbacephem Derivative.

Abstract

A Novel Dieckmann-Type Cyclization, the Final Step of the Synthesis of a Carbacephem Derivative.-Upon treatment with sodium bis(trimethylsilyl)amide followed by triflic anhydride, the azetidinone (I) is cyclized forming the carbacephem derivative (III) as the sole product.-(NEYER, G.; UGI, I.; Synthesis (1991) 9, 743-744; Inst. Org. Chem. Tech. Univ. Muenchen, D-8046 Garching, Fed. Rep. Ger.; EN)