Cobalt-catalyzed cross-couplings of nitrogen-containing heterocyclic phosphonium salts with arylmagnesium halides proceeded efficiently with the aid of cobalt(II) catalyst and copper(I) salt in tetrahydrofuran at ambient temperature, producing the desired 4-arylated pyridine, quinoline, and quinoxaline in modest to good yields.
钴催化的含氮杂环鏻盐与芳基卤化镁的交叉偶联在钴 (II) 催化剂和铜 (I) 盐的帮助下在四氢呋喃中在环境温度下有效进行,产生所需的 4-芳基化吡啶、喹啉和喹喔啉产量适中至良好。
Palladium-Catalyzed Sonogashira Coupling of a Heterocyclic Phosphonium Salt with a Terminal Alkyne
An efficient Sonogashira coupling of a heterocyclic phosphonium salt with a terminalalkyne via C–P bond cleavage was developed. The reactions proceeded smoothly in the presence of palladium catalyst, copper(I) iodide, and N,N-diisopropylethylamine (DIPEA) in N-methyl-2-pyrrolidone (NMP) at 100 °C for 12 h, producing the corresponding alkynyl-substituted pyridine, quinoline, pyrazine, and quinoxaline