作者:Burkhard König、Bianca Attenberger、Harald Schmaderer
DOI:10.1055/s-2008-1067045
日期:2008.6
applicable method for the direct 3-N-arylation of flavins using arylboronic acids and copper acetate was developed. The reaction conditions were optimized considering the lability of flavins in basic conditions and thermal heating. Donor- and acceptor-substituted arylboronic acids were used yielding 3-N-arylflavins in moderate to good yields by C(aryl)-N(imide) bond formation. UV and fluorescence measurements
开发了一种使用芳基硼酸和乙酸铜对黄素进行直接 3-N-芳基化的普遍适用的方法。考虑黄素在碱性条件和加热条件下的不稳定性,对反应条件进行了优化。供体和受体取代的芳基硼酸通过 C(芳基)-N(酰亚胺) 键形成以中等至良好的收率产生 3-N-芳基黄素。紫外和荧光测量表明附加芳族取代基与黄素环系统的正交取向。芳烃取代基不与基态的黄素π-系统电子耦合,但3-N位的富电子芳烃取代基显着降低了黄素的发射强度。