PREPARATION OF 2R,3S-N-ISOBUTYL-N-(2-HYDROXY-3-AMINO-4-PHENYLBUTYL)-P-NITROBENZENESULFONYLAMIDE HYDROCHLORIDE AND OTHER DERIVATIVES OF 2-HYDROXY-1,3-DIAMINES

摘要

The present invention provides a new process for the preparation of 2R,3S-N-isobutyl-N-(2-hydroxy-3-amino-4-phenylbutyl)-p-nitrobenzenesulfonylamide hydrochloride, wherein this compound is prepared directly from the chloromethylalcohol. Importantly, the process of the present invention results in higher yields of 2R,35-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 2R,3S-derivative, but also the 2S,3S-, 2S,2R- and the 2R,3R-derivatives.