Rhodium-Mediated Decarboxylative Conjugate Addition of Fluorinated Benzoic Acids: Stoichiometric and Catalytic Transformations
作者:Zhong-Ming Sun、Pinjing Zhao
DOI:10.1002/anie.200901097
日期:2009.8.24
Depending on the bisphosphine ligand, the decarboxylation of 2,6‐difluorinated benzoic acids with a RhI catalyst in the presence of an acrylic ester or acrylamide led preferentially to conjugate addition (product 1) or Heck–Mizoroki arylation (product 2; binap=2,2′‐bis(diphenylphosphanyl)‐1,1′‐binaphthyl, diop=4,5‐bis(diphenylphosphanylmethyl)‐2,2‐dimethyl‐1,3‐dioxolane).
根据双膦配体的不同,在丙烯酸酯或丙烯酰胺存在下,用Rh I催化剂将2,6-二氟代苯甲酸脱羧会优先导致共轭加成(产物1)或Heck-Mizoroki芳基化(产物2; binap = 2,2'-双(二苯基膦基)-1,1'-联萘基,diop = 4,5-双(二苯基膦基甲基)-2,2-二甲基-1,3-二氧戊环)。