反应详情

A suspension of 3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-7-amino-3-cephem-4-carboxylic acid (1.46 g.), triethylamine (0.9292 g.) and dimethylaniline (0.713 g.) in methylene chloride (30 ml.) was stirred for 20 minutes at room temperature. To the mixture was added a solution of trimethylsilyl chloride (1.043 g.) in methylene chloride (10 ml.) over 5 minutes under ice-cooling, and the mixture was stirred for 2 hours at room temperature and then cooled to -25° C. On the other hand, a suspension of 2-(2-formylamino-1,3-thiazol-4-yl)glyoxylic acid, which can be represented as 2-(2-formylimino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylic acid, (0.96 g.), thionyl chloride (0.697 g.) and dimethylformamide (0.214 g.) in methylene chloride (12 ml.) was stirred for 4 hours, and the mixture was added to the above obtained cooled mixture over 12 minutes at -25° to -20° C. The mixture was further stirred for 30 minutes at the same temperature and for 30 minutes at -20° to -10° C. After the reaction, the reaction mixture was added to water (100 ml.), and stirred for 30 minutes at room temperature. The white precipitates were collected by filtration and then dried to give dark brown powder of 3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-7-[2-(2-formylamino-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid, which can be represented as 3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-7-[2-(2-formylimino-2,3-dihydro-1,3-thiazol-4-yl)glyoxylamido]-3-cephem-4-carboxylic acid.

1. temperaturecooling
2. stirringthe mixture was stirred for 2 hours at room temperature
3. temperaturecooled to -25° C
4. stirringwas stirred for 4 hours
5. additionthe mixture was added to the
6. customabove obtained
7. temperaturecooled mixture over 12 minutes at -25° to -20° C
8. stirringThe mixture was further stirred for 30 minutes at the same temperature and for 30 minutes at -20° to -10° C
9. customAfter the reaction
10. stirringstirred for 30 minutes at room temperature
11. customThe white precipitates
12. filtrationwere collected by filtration
13. customdried