Results Synthesis of AzB-taxol (6). N-(4-Azidobenzoyl)-N-debenzoyltaxol (6) 6 was synthesized as detailed in Scheme 1.'Azetidinone 1 was prepared via the ester enolate- imine cyclocondensation reaction as previously described by US.~-~ O Deprotonation of 1 followed by acylation with benzyl chloroformate provided N-acyl