| abstract |
An objective of the present application is to provide an industrially practicable method for producing an optically-active 3-amino-2-hydroxypropionic cyclopropylamide derivative or salt thereof from an inexpensive easily-available starting material. The derivative or salt thereof is useful as an intermediate for a medicine. It is also intended by the present application to provide a useful intermediate of the derivative. The objective is attained by the following method. First, an easily-available 2-halo-3-oxopropionic acid derivative is asymmetrically reduced, and then epoxidated to produce an optically-active epoxycarboxylic acid derivative. Next, the derivative is converted into an optically-active epoxyamide derivative by reaction with cyclopropylamine, and then reacted with a nitrile to obtain an optically-active oxazolinamide derivative. Subsequently, selective acid solvolysis of the oxazoline skeleton gives the optically-active 3-amino-2-hydroxypropionic cyclopropylamide derivative or salt thereof. |