Synthesis of 3-Substituted 2-Arylpyridines via Cu/Pd-Catalyzed Decarboxylative Cross-Coupling of Picolinic Acids with (Hetero)Aryl Halides
作者:Dagmar Hackenberger、Philip Weber、David C. Blakemore、Lukas J. Goossen
DOI:10.1021/acs.joc.7b00046
日期:2017.4.7
A decarboxylative cross-coupling of 3-substituted picolinic acids with (hetero)aryl halides is presented. In the presence of catalytic Cu2O and Pd(1,5-cyclooctadiene)Cl2 with 2-dicyclohexylphosphino-2′-(N,N-dimethylamino)biphenyl as the ligand, both electron-rich and electron-deficient aryl bromides and chlorides as well as heteroaryl bromides were successfully coupled with various picolinate salts
提出了3-取代的吡啶甲酸与(杂)芳基卤化物的脱羧交叉偶联。在催化性的Cu 2 O和Pd(1,5-环辛二烯)Cl 2以2-二环己基膦基-2'-(N,N-二甲基氨基)联苯为配体的情况下,富电子和缺电子的芳基溴化物和在温和的条件下,将氯化物以及杂芳基溴化物与各种吡啶甲酸盐成功偶联,收率高达96%。该方案提供了有效的进入2-(杂)芳基吡啶的途径,这是药物发现中一种有吸引力的物质。