The present invention provides a new process for the preparation of 2S, 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 2S, 3S-N-isobutyl-N-(2-hydroxy-3-amino-4-phenylbutyl)-p-nitrobenzenesulfonylamide hydrochloride without sacrificing its purity. The processes of the present inventin can be used to prepare not only the 2S,3S-derivative, but also the 2R,3S-, 2S,2R- and the 2R,3R-derivatives.
                            本发明提供了一种制备2S,3S-N-异丁基-N-(2-羟基-3-
氨基-4-苯基丁基)-对
硝基苯磺酰胺盐酸盐的新工艺,其中该化合物直接由
氯甲基醇制备。重要的是,本发明的工艺不仅能够获得更高产率的2S,3S-N-异丁基-N-(2-羟基-3-
氨基-4-苯基丁基)-对
硝基苯磺酰胺盐酸盐,而且不会牺牲其纯度。本发明的工艺不仅可用于制备2S,3S衍
生物,还可用于制备2R,3S-, 2S,2R-和2R,3R-衍
生物。