反应详情

To a solution of 2.51 g. of N-(β,β,β-trichloroethoxycarbonyl)thiourea and 2.66 g. of ethyl α-acetamido-β-oxo-γ-bromobutyrate in 50 ml. of ethanol is added 1.8 g. of N,N-dimethylaniline. The mixture is stirred for 24 hours at room temperature, and condensed under reduced pressure. The residue is dissolved in 30 ml. chloroform and the solution is washed with 3N-HCl, water, and dried. The solid matter which is obtained by removal of chloroform is purified by silica gel chromatography to give ethyl α-acetamido-2-(β,β,β-trichloroethoxycarbonylamino)thiazol-4-ylacetate. 1.43 g. Melting point: 161.9° C.

1. customcondensed under reduced pressure
2. dissolutionThe residue is dissolved in 30 ml
3. washchloroform and the solution is washed with 3N-HCl, water
4. customdried
5. customThe solid matter which is obtained by removal of chloroform
6. customis purified by silica gel chromatography