Directed ortho-lithiation of unprotected diphenylphosphinic acids
作者:Víctor Yañez Rodríguez、Miguel Ángel del Águila、María José Iglesias、Fernando López Ortiz
DOI:10.1016/j.tet.2012.06.088
日期:2012.9
Directed ortho lithiation of diphenylphosphinic acid and subsequent electrophilic trapping provides mono ortho-functionalized derivatives including enantiopure γ-aminophosphinic acids in moderate yields. Copper catalyzed coupling of the ortho anion leads to biphenyl-2,2′-diylbis(phenylphosphinic acid), a phosphorus analogue of biphenyl-2,2′-dicarboxylic acid. Preliminary studies of the metal-binding