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A new example of the stereoselective installation of the amino group at a saturated carbon center via organometallic addition of chiral aldehydes to nitrones is illustrated by the synthesis of 1,3-diamino propanol 1 and 1,4-diamino butandiol 2 units. Three diamino alcohol 1 stereotriads were obtained by stereoselective addition of alkylmagnesium halides (benzyl, cyclohexylmethyl, and metallyl) to the N-benzyl nitrones derived from β-amino-α-hydroxy aldehydes followed by reduction of the resulting N-benzylhydroxylamines. Three 1,4-dibenzyl substituted stereoisomers of type 2 with fixed S configuration at C2 and C3 were prepared by sequential and simultaneous amination in two directions starting from l-threose nitrone and l-tartraldehyde bis-nitrone, respectively. The R,S,S,R isomer obtained by the former route was converted into a seven-membered ring cyclic urea (1,3-diazapin-2-one), i.e., a compound that belongs to a class of nonpeptide HIV-1 protease inhibitors.

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Buon appetito! The synthesis and in vitro and in vivo profiles of a novel series of potent and selective ghrelin ligands is presented. Selected compounds share the same “atypical” ghrelin antagonist profile already observed with the recently disclosed compound GSK1614343, thus exhibiting the same ability to promote food intake and body weight gain in rodents.