反応 #5613

反応方程式

ethyl acetate

7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(1-carboxy-1-methylethoxyimino)acetamido]-3-chloromethyl-3-cephem-4-carboxylic acid trifluoroacetate

2-(N,N-dimethylamino)methyl-5-hydroxy-4pyridone

→

7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(1-carboxy-1-methylethoxyimino)acetamido]-3-[N,N-dimethyl-N-{(5-hydroxy-4-oxo-1,4-dihydropyridin-2-yl)methyl}ammonio]methyl-3-cephem-4carboxylate

収率 29.2%

溶媒

N,N-dimethylformamide

反応条件

後処理

1. 1
   ろ過The resulting precipitate was collected by filtration
2. 2
   洗浄washed with ethyl acetate
3. 3
   その他dried under reduced pressure
4. 4
   workup.STIRRINGstirred for 30 minutes
5. 5
   その他After removal of insoluble material
6. 6
   洗浄The column was washed with water
7. 7
   洗浄the elution
8. 8
   workup.ADDITIONThe fractions containing desired product
9. 9
   その他methanol was evaporated in vacuo

実験手順

To a solution of 7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(1-carboxy-1-methylethoxyimino)acetamido]-3-chloromethyl-3-cephem-4-carboxylic acid trifluoroacetate (syn isomer) (1.0 g) in N,N-dimethylformamide (10 ml) was added 2-(N,N-dimethylamino)methyl-5-hydroxy-4pyridone (1.09 g). After being stirred for 5 hours at ambient temperature, the mixture was poured into ethyl acetate (150 ml). The resulting precipitate was collected by filtration, washed with ethyl acetate and dried under reduced pressure. The precipitate was suspended in water (50 ml) at pH 2.0 and stirred for 30 minutes. After removal of insoluble material, the aqueous solution was subjected to column chromatography on Diaion HP-20. The column was washed with water and the elution was carried out with 30% aqueous methanol. The fractions containing desired product was combined and methanol was evaporated in vacuo. The resulting aqueous layer was lyophilized to give 7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(1-carboxy-1-methylethoxyimino)acetamido]-3-[N,N-dimethyl-N-{(5-hydroxy-4-oxo-1,4-dihydropyridin-2-yl)methyl}ammonio]methyl-3-cephem-4carboxylate (syn isomer) (0.30 g) as a powder.

出典