Copper-catalysed CN/CO coupling in water: a facile access to N-coumaryl amino acids and fluorescent tyrosine & lysine labels
作者:Santosh Kumari、S.M. Abdul Shakoor、Kiran Bajaj、S.H. Nanjegowda、P. Mallu、Rajeev Sakhuja
DOI:10.1016/j.tetlet.2016.05.016
日期:2016.6
A mild, efficient, ligand free and environmentally benign approach towards the construction of sp2 C-sp3 N bond has been developed via copper catalysed Ullmann type of coupling between 4-chlorocoumarin with N-terminus unprotected amino acids in microwave-aqua conditions, yielding a series of N-coumaryl amino acids in good to excellent yields. Excellent photo-physical properties exhibited by these N-coumaryl
通过在微波-水条件下,铜催化的Ullmann型4-氯香豆素与N-末端未保护氨基酸之间的偶联,开发了一种温和,有效,无配体且对环境无害的方法来构建sp 2 C-sp 3 N键,产生一系列N-香豆素氨基酸,收率为好至极好。这些N-香豆素氨基酸具有出色的光物理性质,它们作为N末端肽的C末端偶联伙伴具有化学适用性,使其成为标记研究中的潜在荧光探针。该方法已扩展到C O和CN偶联分别用于合成荧光香豆素标记的酪氨酸和赖氨酸标记。进一步探索了香豆基标记的酪氨酸在合成荧光标记的阿片样四肽Endomorphin-2衍生物中的应用。