Synthesis of 4-amino substituted 1,8-naphthalimide derivatives using palladium-mediated amination
作者:Cassandra L. Fleming、Trent D. Ashton、Frederick M. Pfeffer
DOI:10.1016/j.dyepig.2014.05.006
日期:2014.10
Successful amination of 4-bromo-1,8-naphthalimides with ‘lengthy’ imide N-functionality has been achieved using a general palladium mediated approach (conventional thermal protocols were sub-optimal). Only readily available Pd/ligand combinations were considered and the resulting Buchwald–Hartwig procedure using Pd2(dba)3, Xantphos and Cs2CO3 is high yielding, relatively mild (40–80 °C, 24 h, yields
使用通用的钯介导方法(常规热方案次优),已成功实现了带有“长”酰亚胺N-官能团的4-溴1,8-萘二甲酰亚胺的成功胺化。仅考虑了易于获得的Pd /配体组合,并使用Pd 2(dba)3,Xantphos和Cs 2 CO 3进行了Buchwald-Hartwig程序具有较高的收率,相对温和(40–80°C,24小时,收率50–90%),仅需要适量过量的胺(3.0当量),并与其他酰亚胺N取代基同样有效。这样,该协议是对现有方法的补充,但对于更复杂的基材而言,该协议是优越的。在这里,我们将这种Pd介导的方法与最常用的方法进行比较,并通过合成许多新的高度荧光的4-氨基萘酰亚胺进一步证明其实用性。