反应详情

0.334 g (0.75 mmol) [rac]-2-Amino-3-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzo[b]thiophen-7-yl}-propionic acid ethyl ester (prepared from 4-[2-(7-bromomethyl-benzo[b]thiophen-4-yloxy)-ethyl]-5-methyl-2-phenyl-oxazole [PCT Int. Appl. (2001) WO01/79202] and N-(diphenylmethylene)glycine ethyl ester in analogy to the sequence described in examples 15 a] and 15 b]) and 0.161 g (0.97 mmol) benzoylacetone were dissolved in 25 ml of toluene. Then, 0.21 ml (1.5 mmol) triethylamine and 0.026 g (0.15 mmol) 4-toluene sulfonic acid were added and the reaction mixture was heated at reflux for 2 hours. After removing the solvent under reduced pressure, the residue was diluted in water/sodium hydrogen carbonate solution and the reaction mixture was extracted with dichloromethane. The combined organic phases were dried over MgSO4 and evaporated. Purification of the residue by flash-chromatography (silica gel, eluent: gradient of hexane and ethyl acetate) gave 0.38 g (85%) [rac]-2-[1-methyl-3-oxo-3-phenyl-(Z)-propenylamino]-3-{4-[2-(5-methyl-2-phenyl-oxazol-4-yl)-ethoxy]-benzo[b]thiophen-7-yl}-propionic acid ethyl ester as light yellow oil.

1. temperaturethe reaction mixture was heated
2. temperatureat reflux for 2 hours
3. customAfter removing the solvent under reduced pressure
4. additionthe residue was diluted in water/sodium hydrogen carbonate solution
5. extractionthe reaction mixture was extracted with dichloromethane
6. dry with materialThe combined organic phases were dried over MgSO4
7. customevaporated
8. customPurification of the residue by flash-chromatography (silica gel, eluent: gradient of hexane and ethyl acetate)