N-Protected7-amino-7-methoxy cephems are synthesised from methylN-(O-methoxycarbonylbenzoyl)methoxy(thiocarbamoyl)glycinate in two major steps: construction of the thiazine ring and subsequent closure of the β-lactam ring.
M. Lees, M. Chehna, M. A. Riahi, G. Duguay and H. Quiniou, J. Chem. Soc., Chem. Commun., 1984, 157 DOI: 10.1039/C39840000157
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