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Diaminopropanols and corresponding amidopropanols constitute one of the most common central units of various protease inhibitors such as b- or c-secretase,1 HIV protease,2 cathepsins,3 or plasmepsins.4 The scaffold 1 (Fig. 1) is a typical example of 1,3-diaminoalkan-2-ol-based structure of inhibitors. Hydroxylethylamine motifs can be easily obtained by oxirane ring opening reactions, which furthermore allow the access of a wide structural diversity of compounds. Recently, Concell¨®n et al. described an easy access to 1,3-diaminoalkan-2-ols by a ring opening of amino epoxides through a Ritter reaction with nitriles.5 This reaction permitted a direct and selective introduction of an acylamino function and offers an excellent alternative to the classical aminolysis of oxiranes. Furthermore, the reaction provided the diaminoalcohol with a protection different for each amino group, what is particularly useful for further coupling to prepare inhibitors (Scheme 1). |
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