Aryl Phosphoramides: Useful Electrophiles for Suzuki-Miyaura Coupling Catalyzed by a NiCl2/dppp System (dppp=1,3-Bis(diphenylphosphino)propane)
作者:Yu-Long Zhao、You Li、Yu Li、Lian-Xun Gao、Fu-She Han
DOI:10.1002/chem.201000420
日期:——
Suzuki–Miyauracoupling: We disclose a new strategy for phenol activation in the first Suzuki–Miyauracoupling of phenol derivatives activated by forming aryl bis(2‐oxo‐3‐oxazolidinyl)phosphines as a highly efficient and broadly applicable methodology for the diverse synthesis of biaryls and heterobiaryls (see scheme). The use of readily available, stable NiCl2/dppp as the catalyst system also provides
Microwave-Promoted Copper-Free Sonogashira-Hagihara Couplings of Aryl Imidazolylsulfonates in Water
作者:José F. Cívicos、Diego A. Alonso、Carmen Nájera
DOI:10.1002/adsc.201200629
日期:2013.1.14
Aryl imidazol‐1‐ylsulfonates have been efficiently cross‐coupled with aryl‐, alkyl‐, and silylacetylenes in neat water under copper‐free conditions at 110 °C assisted by microwave irradiation. Using 0.5 mol% of an oxime palladacycle as precatalyst, 2‐dicyclohexylphosphino‐2′,6′‐dimethoxybiphenyl (SPhos, 2 mol%) as ligand, hexadecyltrimethylammonium bromide (CTAB) as additive, and triethylamine (TEA)