Previous studies of α-glucosidase inhibitors derived from thalidomide revealed that 4, 5, 6, 7- tetrachloro-N-alkylphthalimide derivatives are superior lead compounds. Structure-activity relationship studies indicated that a hydrophobic group at the N (2) position is mandatory for potent activity. Accordingly, we have designed and synthesized some 4, 5, 6, 7-tetrachloro-N- cycloalkylphthalimide and 4, 5, 6, 7-tetrachloro-N-dicarba-closo-dodecaborane ...