The benzyl ester (3) and p-nitrobenzyl ester (PNB ester)(4) of the antibiotic PS-5 and the bis-protected PS-6 (5) were stereoselectively synthesised by application of the new carbon–carbon bond formation reaction at the C-4-position of 4-acetoxy-3-ethyl- or 4-acetoxy-3-ethyl- or 4-acetoxy-3-isopropyl-azetidin-2-ones [(10) or (11)].
T. Kametani, T. Honda, A. Nakayama, Y. Sasakai, T. Mochizuki and K. Fukumoto, J. Chem. Soc., Perkin Trans. 1, 1981, 2228 DOI: 10.1039/P19810002228
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