Naphthalenyl- and anthracenyl-ethynyl dT analogues as base discriminating fluorescent nucleosides and intramolecular energy transfer donors in oligonucleotide probes
摘要:
Fluorescent thymidine analogues functionalised in the 5-position with the moieties naphthalenylethynyl (NeT), anthracenylethynyl (AeT) and anthracenylbuta-1,3-diynyl (AeeT) have been incorporated into oligonucleotides. The modified oligonucleotides undergo significant emission enhancement when hybridised to fully complementary strands and a decrease in fluorescence emission when the modified thymine is paired with guanine. Thus these analogues are potentially useful as base discriminating fluorescent nucleosides (BDFs). When a fluorescein dT monomer is incorporated into the same oligonucleotide strand as the modified base, energy transfer enhances the fluorescein emission, particularly upon duplex formation. These dual-labelled probes may be useful for genetic analysis to detect point mutations and SNPs and could provide multiplexing capability. (c) 2007 Elsevier Ltd. All rights reserved.
Zinc-mediated enantioselective addition of terminal 1,3-diynes to N-arylimines of trifluoropyruvates
作者:Fa-Guang Zhang、Hai Ma、Yan Zheng、Jun-An Ma
DOI:10.1016/j.tet.2012.05.086
日期:2012.9
A facile and effective enantioselectiveaddition of terminal 1,3-diynes to acyclic α-CF3 ketimine esters has been developed by using zinc/Binol complexes. The reaction works well with a variety of aromatic-, aliphatic- and silyl-substituted diynes, providing the desired products in up to 97% yield and 97% enantiomeric excess.