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. Author manuscript; available in PMC: 2010 Aug 13.
Published in final edited form as: Chem Commun (Camb). 2008 Oct 1;(46):6095–6107. doi: 10.1039/b810957e

Scheme 3.

Scheme 3

Preparative routes for the hybrid urea/amide ligands. Reagents and conditions: (a) potassium phthalimide, DMF, 80 °C, 73%; (b) H2NNH2·H2O, EtOH, heat, >98%; (c) 6–8, Et3N, heat, NaI (cat.); (d) BnNH2,Et3N, NaI (cat.), THF, heat, 77%; (e) cyclohexene, Pd/MeOH, heat, 86%; (f) 6–8, Et3N, heat.