Synthesis and fluorescence of xanthone amino acids
摘要:
Fmoc- and Boc-protected alpha-amino acids bearing xanthone as side chain are easily accessible by palladium-catalyzed cross-coupling of a xanthone triflate with appropriate amino acid residues. The xanthone triflate was obtained in three steps taking advantage of a high-yield and mild copper-catalyzed diarylether formation. The new xanthone amino acid (Xan-aa) shows typical xanthone fluorescence properties suitable for studying folding processes of polypeptides by triplet-triplet energy transfer (TTET). (c) 2013 Elsevier Ltd. All rights reserved.
Fmoc- and Boc-protected alpha-amino acids bearing xanthone as side chain are easily accessible by palladium-catalyzed cross-coupling of a xanthone triflate with appropriate amino acid residues. The xanthone triflate was obtained in three steps taking advantage of a high-yield and mild copper-catalyzed diarylether formation. The new xanthone amino acid (Xan-aa) shows typical xanthone fluorescence properties suitable for studying folding processes of polypeptides by triplet-triplet energy transfer (TTET). (c) 2013 Elsevier Ltd. All rights reserved.