反应详情

In 3 ml of methylene chloride was suspended 0.35 g (0.53 mmole) of 7-[2-(2-amino-1,3-thiazol-4-yl)-2-carbazoylmethoxyiminoacetamido]-3-[(5-methyl-1,3,4-thiadiazol-2-yl)thiomethyl]-3-cephem-4-carboxylic acid.dihydrochloride obtained in Reference example 9 and the suspension was dissolved by adding 1.35 g (6.66 mmole) of N,O-bis(trimethylsilyl)acetamide. To the mixture was added 0.136 g (0.53 mmole) of 3,4-diacetoxybenzoic acid chloride and the mixture was stirred at room temperature for one hour. The mixture was poured into 200 ml of ether and added thereto a small amount of methanol while stirring. The resulting precipitates were collected by filtration, washed with water and then dried to obtain 0.42 g of the title compound. (Yield: 94.1%)

1. customobtained in Reference example 9
2. dissolutionthe suspension was dissolved
3. additionadded
4. customThe resulting precipitates
5. filtrationwere collected by filtration
6. washwashed with water
7. customdried