A 1:1 1,4-dioxane–tert-butyl acetate mixture and BF3 etherate were used for an effective 6-aminopenicillanic acid conversion into the tert-butyl ester (64±3% yield) which could be easily transformed into tert-butyl 6-oxo- and 6-diazo-penicillanates.
G. Veinberg, M. Vorona, D. Musel, N. Grigan and E. Lukevics, J. Chem. Res. (S), 1999, 270 DOI: 10.1039/A808587K
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