反应详情

A 263 mg quantity of benzyl 2-[3-phenoxyacetamido-4-(5-methoxybenzothiazol-2-yldithio)-2-azetidinon-1-yl]-3-methyl-3-butenoate and 147 mg of 5-methoxybenzothiazol-2-yl benzenethiosulfonate were dissolved in 2.5 ml of acetone. To the solution were added 0.5 ml of water and then 2 mg of sodium benzenesulfinate and the mixture was stirred at room temperature for 3 hour. The precipitated 5-methoxybenzothiazol-2-yl disulfide crystals were filtered and the filtrate was concentrated under reduced pressure. The residue was treated in the same manner as in Example 41, giving benzyl 2-(3-phenoxyacetamido-4-benzenesulfonylthio-2-azetidinon-1-yl)-3-methyl-3-butenoate in a yield of 96%. The NMR spectrum data of the compound were identical with those of the desired compound. Table 2 shows the NMR spectrum data of the compound.

1. filtrationThe precipitated 5-methoxybenzothiazol-2-yl disulfide crystals were filtered
2. concentrationthe filtrate was concentrated under reduced pressure
3. additionThe residue was treated in the same manner as in Example 41