| abstract |
A beta -lactam compound and a 2-(substituted methyl)-3-cephem compound, both being useful as an intermediate for the synthesis of cephem antibiotics and so forth. The lactam compound is represented by general formula (I), wherein R<1> represents protected amino, etc.; R<2> represents hydrogen, etc.; R<3> represents hydrogen or a protective group for a carboxyl group; R<4> represents optionally substituted aryl; and R<5> represents optionally substituted alkenyl, etc. The cephem compound is represented by general formula (II), wherein R<1>, R<2> and R<3> are each as defined above; and R<6> represents optionally substituted aryl. <CHEM> |