A study of chiral oxazoline ligands with a 1,2,4-triazine and other six-membered aza-heteroaromatic rings and their application in Cu-catalysed asymmetric nitroaldol reactions
作者:Ewa Wolińska
DOI:10.1016/j.tetasy.2014.10.001
日期:2014.11
Enantiomerically pure oxazoline ligands with variously substituted 1,2,4-triazine rings have been synthesized using the Pd-catalysed cross-coupling amination of 3-halo-1,2,4-triazines. The catalytic efficiency of the ligands was studied in the asymmetric Henry reaction of nitromethane with several aldehydes. The appropriate β-nitro alcohols were formed in good yields (up to 93%) and with up to 78%
与各种取代的1,2,4-三嗪环的对映体纯的恶唑啉配位体已被使用的3-卤代-1,2,4-三嗪的钯催化的交叉偶联胺化合成。的配位体的催化效率与若干醛硝基甲烷的不对称亨利反应进行了研究。形成良好的产率(高达93%),并用高达78%ee的适当的β-硝基醇。对硝基醛醇反应的1,2,4-三嗪环的取代的影响进行了讨论。为了调查关于配体的催化活性的1,2,4-三嗪环的影响,配体,其中1,2,4-三嗪环替换为吡啶,嘧啶,吡嗪或吡啶ñ -氧化物环合成并应用到不对称硝基醛醇反应。