7Sames P G. Topics in antibiotic chemistry [ M]. Wiley: Chichester, UK, 1980.
8Shum-ichi M, Takao S, Takeshi N, et al. Rutheniumcatalyzed oxidation of β-lactams with molecular oxygen and aldehydes[J]. Tetrahedron Lett, 1991,32 (42) :5991-5994.
9Shum-ichi M, Takao S, Takeshi N, et al. Osmiumcatalyzed oxidation of β-lactams with peroxides [J]. Tetrahedron Lett, 1991,32(19) :2145-2148.
10Christopher J E, Stephen G L, Peng W. Acyloxylation at the 4-position of azetidin-2-ones [J]. J Chem Soc Perkin Trans I 1990,277-281.