反应详情

To a stirred suspension of 1.0 g (0.0028 mole) of 6-(2-bromoacetamido)-2,2-dimethyl-3-(5-tetrazolyl)penam in 25 ml of methylene chloride is added 0.28 g (0.0028 mole) of triethylamine. The mixture is stirred at ambient temperature until a clear solution is obtained, and then 0.39 g of 4-mercaptopyridine is added. Stirring is continued for a further 4 hours at ambient temperature, and then the solid which has precipitated is filtered off. It is washed with methylene chloride, followed by ether, to give 0.68 g (78% yield) of 6(2-[4-pyridylthio]acetamido)-2,2-dimethyl-3-(5-tetrazolyl)penam, m.p. 120° C. (dec.). The infrared spectrum of the product (KBr disc) shows absorption bands at 1790 cm-1 (β-lactam), 1670 cm-1 (amide II). The NMR spectrum (DMSO-d6) show absorption bands at 9.0-7.0 ppm (multiplet, pyridine hydrogens), 5.9-5.5 ppm (multiplet, C-5 and C-6 hydrogen), 4.0 ppm (singlet, methylene hydrogens), 1.7 ppm (singlet, C-2 methyl hydrogens) and 1.1 (singlet, C-2 methyl hydrogens).

1. customis obtained
2. stirringStirring
3. customthe solid which has precipitated
4. filtrationis filtered off
5. washIt is washed with methylene chloride