Synthesis of 1,3-diarylated imidazo[1,5-a]pyridines with a combinatorial approach: metal-catalyzed cross-coupling reactions of 1-halo-3-arylimidazo[1,5-a]pyridines with arylmetal reagents
作者:Fumitoshi Shibahara、Eiji Yamaguchi、Asumi Kitagawa、Akio Imai、Toshiaki Murai
DOI:10.1016/j.tet.2009.02.062
日期:2009.6
reagents led to 1,3-diarylated imidazo[1,5-a]pyridines in good to excellent yields. Suzuki–Miyaura cross-coupling of the 1-bromo-3-phenylimidazo[1,5-a]pyridine and p- or m-methoxycarbonylphenylboronic acids furnished the coupling product in respective yields of 91% and 61%. The obtained 1,3-diarylated imidazo[1,5-a]pyridines showed a wide variety of fluorescent emissions in a wavelength range of 449–533 nm
用碘,溴,N-氯代琥珀酰亚胺和1-氟-2,4,6-三甲基吡啶四氟硼酸盐作为卤化剂进行3-芳基咪唑并[1,5- a ]吡啶的卤化反应,得到选择性卤化的产物1-卤-3-芳基咪唑并[1,5- a ]吡啶的产率高至优异。所获得的1-碘-3-芳基咪唑并[1,5- a ]吡啶和芳基格氏试剂的Kumada-Tamao-Corriu交叉偶联导致1,3-二芳基化的咪唑并[1,5- a ]吡啶良好或优异。产量。1-溴-3-苯基咪唑并[1,5- a ]吡啶与p-或m的铃木-宫浦交叉偶联-甲氧基羰基苯基硼酸分别以91%和61%的产率提供了偶联产物。与单芳基化的相比,获得的1,3-二芳基化的咪唑并[1,5- a ]吡啶在449-533 nm的波长范围内具有多种荧光发射,并具有提高的量子产率。