Patent AT-E401298-T1: [Translated] IMPROVED METHOD FOR PRODUCING 2S,3S- N-ISOBUTYL-N-(2-HYDROXY-3-AMINO-4-PHENYLBUTYL)- - NITROBENZENESULFONYLAMIDE HYDROCHLORIDE AND OTHER DERIVATIVES OF 2-HYDROXY-1,3-DIAMINE

The present invention provides a new process for the preparation of 2S,3S-N-isobutyl-N-(2-hydroxy-3-amino-4-phenylbutyl)-p-nitrobenzenesulfonyl amide hydrochloride, wherein this compound is prepared directly from the chloromethyl alcohol. Importantly, the process of the present invention results in higher yields of 2S,3S-N-isobutyl-N-(2-hydroxy-3-amino-4-phenylbutyl)-p-nitrobenzenesulfonylamide hydrochloride without sacrificing its purity. The processes of the present invention can be used to prepare not only the 2S,3S-derivative, but also the 2R,3S-, 2S,2R- and the 2R,3R-derivatives.