Sequential Pd(II)−Pd(0) Catalysis for the Rapid Synthesis of Coumarins
摘要:
Electrophilic palladium-catalyzed cycloisomerization of brominated aryl propiolates produces brominated coumarins. The brominated cournarins can be diversified by reduction of the Pd(II) catalyst to Pd(O) followed by Suzuki, Sonogashira, Heck, or Hartwig-Buchwald coupling. Thus, a single loading of precatalyst can be used to conduct sequential reactions, allowing the synthesis of functionalized coumarins. Extension of this methodology toward the synthesis of coumarin libraries is discussed.
Sequential Pd(II)−Pd(0) Catalysis for the Rapid Synthesis of Coumarins
作者:Kelin Li、Yibin Zeng、Ben Neuenswander、Jon A. Tunge
DOI:10.1021/jo050671l
日期:2005.8.1
Electrophilic palladium-catalyzed cycloisomerization of brominated aryl propiolates produces brominated coumarins. The brominated cournarins can be diversified by reduction of the Pd(II) catalyst to Pd(O) followed by Suzuki, Sonogashira, Heck, or Hartwig-Buchwald coupling. Thus, a single loading of precatalyst can be used to conduct sequential reactions, allowing the synthesis of functionalized coumarins. Extension of this methodology toward the synthesis of coumarin libraries is discussed.
Paushkin, Ya. M.; Panidi, I. S., 1963, # 44, p. 33 - 38