反应详情

温度

22.5 °C

To a suspension of (Z)-2-(2-aminothiazol-4-yl)-2-(2-tert-butoxycarbonylprop-2-oxyimino) acetic acid (monoblocked acid) (100 g) prepared as in Example 1 in methylene chloride (1.74 lt) is added triethylamine (33.76 g) slowly at 5-10° to obtain a clear solution. Add triphenylchloromethane (118.5 g) at 5-10° and then mass temperature is raised to 36-38°. The resulting reaction mixture is stirred for 6 hours. It is then cooled to 20-25° and washed with DM water. The organic layer is concentrated and toluene is added to the residue. The resulting slurry is cooled to 20-25° C., the product is filtered, washed with toluene and dried under reduced pressure at 40-45° C. Yield 171 g (98.5% of theory), water <0.2% w/w, assay 96-97% w/w, methylene chloride 2-2.5% w/w and toluene 1-2% w/w.

1. customto obtain a clear solution
2. customThe resulting reaction mixture
3. temperatureIt is then cooled to 20-25°
4. washwashed with DM water
5. concentrationThe organic layer is concentrated
6. additiontoluene is added to the residue
7. filtrationthe product is filtered
8. washwashed with toluene
9. customdried under reduced pressure at 40-45° C