Process for producing amide derivatives and intermediates

摘要

A method for producing an amide derivative of the formula ÄXVÜ wherein each symbol is as defined in the specification, and an enantiomer thereof, a novel intermediate useful for producing said compound and a production method thereof. The production method of the present invention is extremely easy and simple as compared to the conventional methods, and enables effective production of compound ÄXVÜ at high yields, which includes compound ÄXVIÜ having an HIV protease inhibitory action. In addition, the novel intermediates of the present invention are extremely useful as intermediates for producing not only the aforementioned compound ÄXVIÜ but also compounds useful as X-ray contrast media.