... Coupling of the amino ligands P2!NH2 with 1 in the presence of 1- hydroxybenzotriazole (HOBt) in DMF [11, 12] or di- phenylphosphochloridate ... 2004, 337, 587−598 ... effect of the P2 moiety in series 8. Secondly, introduction of a polar substitute at the o-, m-, or p-position on the ...