We have developed a convenient and efficient approach for P-arylation of organophosphorus compounds containing P−H. Using commercially available and inexpensive proline and pipecolinic acid as the ligands greatly improved the efficiency of the coupling reactions, so the method can provide an entry to arylphosphonates, arylphosphinates and arylphosphine oxides.
Compounds of Formula 1, as shown below and defined herein:
and pharmaceutically acceptable salts, synthesis, intermediates, formulations, and methods of disease treatment therewith, including cancers mediated at least in part by FAK.
The palladium-catalyzed cross-coupling of dialkylphosphite with aromatic electrophiles (Hirao coupling) was re-investigated. Some limitations in terms of palladium loadings and substrate reactivity are alleviated with the use of Pd(OAc)(2) complexed to 1,1'-bis(diphenylphosphino) ferrocene (dppf) as a ligand. Various aryl and heteroaryl halides are employed to deliver both known and novel substituted phosphonates. The first examples of aryl chloride couplings are also reported. (C) 2008 Elsevier B.V. All rights reserved.