A Modular Synthesis of Alkynyl-Phosphocholine Headgroups for Labeling Sphingomyelin and Phosphatidylcholine
摘要:
A general route to phospho- and sphingolipids that incorporate an alkyne in the phosphocholine headgroup is described. The strategy preserves the ammonium functionality of the phosphocholine and call be easily modified to introduce desired functional groups at the N-acyl chain. The targets accessible with this strategy provide a bioorthogonal handle for postsynthetic introduction of fluorophores or other labeling agents with aqueous phase chemistry. We report the synthesis of sphingomyelin derivatives that incorporate a fluorophore and an alkyne. The modified sphingolipids retain activity as substrates for sphingomyelinase, making these compounds viable probes of enzymatic activity. Importantly, the strategy allows modification of the lipid across the phosphodiester, making the alkyne a potential probe of sphingomyelinase activity.
Identification of fluorogenic and quenched benzoxadiazole reactive chromophores
摘要:
The Sharpless-Meldal reaction was employed to generate triazole-substituted, alkynyl, azido and tri-azolyl-benzoxadiazole as well as nitro-benzoxadiazole fluorophores Linkage of the triazole to the benzoxadiazole ring at C4 gave chromophores which were fluorogenic, while attachment through NI resulted in quenching The 4-azalo-7-nitrobenzoxadiazole underwent a 470-fold decrease in quantum yield upon conversion to the triazole While, 5-ethynyl-benzoxadiazole exhibited a 48-fold enhancement of quantum yield upon formation of tnazole The modulating effects of solvent polarity, conjugation, and attachment point of the fluorochrome to the tnazole were examined (C) 2010 Elsevier Ltd. All rights reserved.
A Modular Synthesis of Alkynyl-Phosphocholine Headgroups for Labeling Sphingomyelin and Phosphatidylcholine
作者:Mahendra S. Sandbhor、Jessie A. Key、Ileana S. Strelkov、Christopher W. Cairo
DOI:10.1021/jo901824h
日期:2009.11.20
A general route to phospho- and sphingolipids that incorporate an alkyne in the phosphocholine headgroup is described. The strategy preserves the ammonium functionality of the phosphocholine and call be easily modified to introduce desired functional groups at the N-acyl chain. The targets accessible with this strategy provide a bioorthogonal handle for postsynthetic introduction of fluorophores or other labeling agents with aqueous phase chemistry. We report the synthesis of sphingomyelin derivatives that incorporate a fluorophore and an alkyne. The modified sphingolipids retain activity as substrates for sphingomyelinase, making these compounds viable probes of enzymatic activity. Importantly, the strategy allows modification of the lipid across the phosphodiester, making the alkyne a potential probe of sphingomyelinase activity.
Identification of fluorogenic and quenched benzoxadiazole reactive chromophores
作者:Jessie A. Key、Christopher W. Cairo
DOI:10.1016/j.dyepig.2010.05.007
日期:2011.1
The Sharpless-Meldal reaction was employed to generate triazole-substituted, alkynyl, azido and tri-azolyl-benzoxadiazole as well as nitro-benzoxadiazole fluorophores Linkage of the triazole to the benzoxadiazole ring at C4 gave chromophores which were fluorogenic, while attachment through NI resulted in quenching The 4-azalo-7-nitrobenzoxadiazole underwent a 470-fold decrease in quantum yield upon conversion to the triazole While, 5-ethynyl-benzoxadiazole exhibited a 48-fold enhancement of quantum yield upon formation of tnazole The modulating effects of solvent polarity, conjugation, and attachment point of the fluorochrome to the tnazole were examined (C) 2010 Elsevier Ltd. All rights reserved.