反应详情

Following the procedure of Example 2, the title compound (888 mg., 50%) was prepared from (6R,7R)-7-amino-3-carbamoyloxymethylceph-3-em-4-carboxylic acid (1.09 g., 4 mmole) and sodium 2-methoxyimino-2-(thien-2-yl)acetate (syn -isomer) (923mg., 4.8 mmole). Its properties are: m.p. 157° to 163°, [α]D20° + 57.3° (c 1.0 in dioxan), RPAC 0.8* Solvent system A*,λmax. (pH6 buffer) 262.5 nm (ε 15,550), and inflexion at 235 nm (ε 10,350), τ (DMSO-d6) 0.20 (d, J 8 Hz, NH), 2.29 (dd, J 2 and 5 Hz, thienyl C5 -H), 2.7 to 2.9 (m, thienyl C3 -H and C4 -H), 3.40 (s, CONH2), 4.13 (dd, J 5 and 8 Hz, C7 -H), 4.75 (d, J 5 Hz, C6 -H), 5.01 and 5.34 (AB-q, J 13 Hz, C3 -CH2), 6.08 (s, NOCH3), and 6.42 (collapsed AB-q, C2 -H2), νmax. (Nujol) 3700 to 2100 (CO2H), 3480, 3440, 3365, and 3255 (NH and NH2), 1760 (azetidin-2-one), 1722 (CO2H), 1709 (OCONH2) and 1652 and 1530 cm-1 (amide).