The present invention discloses a chemoenzymatic process for the preparation of an iminocyclitol corresponding to formula (I), (II), (III) or (IV), wherein: R1 and R2 are the same or different, and independently selected from the group consisting of: H, OH,
hydroxymethyl, methyl, ethyl, butyl, pentyl, hexyl, octyl,
isopropyl, isobutyl, 2-methylbutyl, and benzyl; R3 is selected from the group consisting of: H,
hydroxymethyl, hydroxyethyl, ethyl, butyl, pentyl, hexyl, octyl, dodecyl, isobutyl,
isopropyl, isopentyl, 2-methylbutyl, benzyl, and phenylethyl; n: 0 or 1; the process comprising: (i) an aldol addition catalyzed by a D-
fructose-6-
phosphate aldolase
enzyme (FSA) and an
acceptor aminoaldehyde; and (ii) an intramolecular
reductive amination of the addition
adduct obtained in step (i) with H2, in the presence of a
metallic catalyst, optionally being carried out said step (ii) in the presence of an
aldehyde of formula R3—CHO, wherein R3 is as defined above.