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A green synthetic route for the synthesis of some potential enzyme active hydroxypiperidine iminosugars including 1,5-dideoxy-1,5-imino-ribitol and 1,5-dideoxy-1,5-imino- dl -arabinitol, starting from commercially available  d -ribose and  d -lyxose was tested out. Heterogeneous catalysts including Au/Al 2 O 3 , SO 4  2− /Al 2 O 3  as well as environmentally friendly reagents were employed into several critical reaction of the route. The synthetic route resulted in good overall yields of 1,5-dideoxy-1,5-imino-ribitol of 54%, 1,5-dideoxy-1,5-imino- d -arabinitol of 48% and 1,5-dideoxy-1,5-imino- l -arabinitol of 46%. The Au/Al 2 O 3  catalyst can be easily recovered from the reaction mixture and reused with no loss of activity.

Green synthesis of 1,5-dideoxy-1,5-imino-ribitol and 1,5-dideoxy-1,5-imino-dl-arabinitol from natural d-sugars over Au/Al2O3 and SO42−/Al2O3 catalysts