三溴-2,6-二甲基吡啶与(2-甲氧基苯基)硼酸的铃木反应得到三种阻转异构体混合物形式的3,4,5-三(2-甲氧基苯基)-2,6-二甲基吡啶,在室内温度。每种异构体都经过分离和充分表征,包括通过 X 射线结构测定。其中一种异构体是外消旋混合物,通过使用半制备手性 HPLC 将其分离为单独的对映异构体。它们的绝对立体化学最初是根据 CD 光谱的计算计算确定的,最终通过 X 射线分析确认。
Efficient synthesis of differently substituted triarylpyridines with the Suzuki-Miyaura cross-coupling reaction
作者:Dariusz Adam Błachut、Joanna Szawkało、Piotr Pomarański、Piotr Roszkowski、Jan K. Maurin、Zbigniew Czarnocki
DOI:10.3998/ark.5550190.p009.772
日期:——
A library of differently substituted 3,4,5-triaryl-2,6-dimethylpyridines and 2,3,5-triaryl-4,6-dimethylpyridines were synthesized and characterized using the Suzuki-Miyaura cross-couplingreaction with accordingly selected tribromodimethylpyridines and arylboronic acids. The optimized coupling conditions were found to be general for both isomeric tribromodimethylpyridines and a wide range of arylboronic