反应详情

To a slurry of dry acetone (5 ml.) and 6-triphenylmethylamino-2,2-dimethyl-3-(5-tetrazolyl)penam (483 mg., 1.0 mmole) at room temperature is added p-toluenesulfonic acid monohydrate (209 mg., 1.1 mmole). The resulting solution is stirred for 10 minutes, and then ether (30 ml.) is added over a five minute period. The mixture is stirred for ten minutes after which the solvent is decanted from the residue. The residue is dissolved in tetrahydrofuran (30 ml.) and placed on a column (300×6 mm.) packed with 10 g. of Florisil (synthetic magnesium silicate). The column is eluted with tetrahydrofuran until a total of 125 ml. is collected. The eluate is concentrated to dryness under reduced pressure at 40° C. to give 210 mg. of solid. The solid is slurried in ether (30 ml.), filtered, washed with ether and air-dried. Yield=121 mg. (50%). NMR (DMSO-d6): 5.88 (s, 3H), 5.10 (s, 3H) 5.52 (d, 1H), 4.60 (d, 2H), 1.59 (s, 3H) and 1.08 ppm (s, 3H).

1. stirringThe mixture is stirred for ten minutes after which the solvent
2. customis decanted from the residue
3. dissolutionThe residue is dissolved in tetrahydrofuran (30 ml.)
4. washThe column is eluted with tetrahydrofuran until a total of 125 ml
5. customis collected
6. concentrationThe eluate is concentrated to dryness under reduced pressure at 40° C.
7. customto give 210 mg
8. filtrationfiltered
9. washwashed with ether
10. customair-dried