A simple method of preparing trimethylsilyl- and tert-butyldimethylsilyl-enol ethers of α-diazoacetoacetates and their use in the synthesis of a chiral precursor to thienamycin analogs

Les enols ethers du titre (A) sont prepares par action des trifluoromethanesulfonates de trialkylsilyle sur des α-diazoacetylacetates; l'action de l'acetoxy-4 t-butyldimethylsiloxy-1' ethyl-3 azetidinone-2 sur les composes A conduit aux α-diazo hydroxy-1' ethyl-3 oxo-4 azetidineacetylacetates-2