d-Glucosamine, a natural aminosugar as organocatalyst for an ecofriendly direct aldol reaction of ketones with aromatic aldehydes in water

d-Glucosamine, one of the important sugars of natural origin catalyzes direct aldol reaction of different aromatic aldehydes with acyclic or cyclic ketones. Diastereo- and enantioselection varies with the substituent on the benzene ring of the aromatic aldehydes used.