[EN] A METHOD OF PREPARATION OF (1'R,3R,4R)-4-ACETOXY-3-(1'-(TERT-BUTYLDIMETHYLSILYLOXY)ETHYL)-2-AZETIDINONE, A PRECURSOR FOR CARBAPENEM ANTIBIOTICS SYNTHESIS [FR] MÉTHODE DE PRÉPARATION DU COMPOSÉ (1'R,3R,4R)-4-ACÉTOXY-3-(1'-(TERT-BUTYLDIMÉTHYLSILYLOXY)ÉTHYL)-2-AZÉTIDINONE, PRÉCURSEUR DE SYNTHÈSE D'ANTIBIOTIQUES DE CARBAPÉNÈME
A novel, practical and stereoselective synthesis of (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone, a keyintermediate in the preparation of β-lactam antibiotics is reported. The crucial step of the synthesis is based on the Cu(I)-mediated Kinugasa cycloaddition/rearrangement cascade between silyl protected (R)-3-butyn-2-ol and the nitrone derived from benzyl hydroxylamine