反应详情

A mixture of benzhydryl 7-[2-(6-aminopyridin-2-yl)-2-tert-butoxycarbonylmethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (6.0 g), anisole (10 ml) and trifluoroacetic acid (60 ml) was stirred at ambient temperature for an hour. The reaction mixture was poured into diisopropyl ether (600 ml) with stirring, and the precipitated substance was collected by filtration, washed with diisopropyl ether and then dissolved in water (100 ml), followed by adjusting to pH 7.5 with 5% aqueous sodium bicarbonate and washing with ethyl acetate (50 ml). The resultant aqueous solution was adjusted to pH 2.5 with conc. hydrochloric acid, and extracted with ethyl acetate (200 ml) and tetrahydrofuran (200 ml). The remaining aqueous solution was further adjusted to pH 1.5 with conc. hydrochloric acid and extracted with tetrahydrofuran (100 ml). The combined extracts were washed with a saturated aqueous sodium chloride and then dried over magnesium sulfate. Removal of the solvent gave a residue, which was washed with acetone and diisopropyl ether to obtain 7-[2-(6-aminopyridin-2-yl)-2-carboxymethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylic acid (syn isomer) (2.4 g), mp 173°-178° C. (dec.).

1. stirringwith stirring
2. filtrationthe precipitated substance was collected by filtration
3. washwashed with diisopropyl ether
4. dissolutiondissolved in water (100 ml)
5. washwashing with ethyl acetate (50 ml)
6. extractionextracted with ethyl acetate (200 ml) and tetrahydrofuran (200 ml)
7. extractionextracted with tetrahydrofuran (100 ml)
8. washThe combined extracts were washed with a saturated aqueous sodium chloride
9. dry with materialdried over magnesium sulfate
10. customRemoval of the solvent
11. customgave a residue, which
12. washwas washed with acetone and diisopropyl ether