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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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