Abstract
A novel, practical and stereoselective synthesis of (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone, a key intermediate 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 and benzyl glyoxylate. The obtained adduct is subjected to debenzylation with sodium, or lithium in liquid ammonia followed by oxidation with lead tetraacetate to afford the final product.
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Acknowledgements
The authors are grateful to the European Union within European Regional Development Fund (Project POIG.01.01.02.-14-102/09) for financial support of research.
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This work is dedicated to Professor Kuniaki Tatsuta commemorating his 101 total synthesis.
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Grzeszczyk, B., Stecko, S., Mucha, Ł. et al. A practical preparation of the key intermediate for penems and carbapenems synthesis. J Antibiot 66, 161–163 (2013). https://doi.org/10.1038/ja.2013.8
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DOI: https://doi.org/10.1038/ja.2013.8
