Dinucleotides of 4′-C-vinyl- and 5′-C-allylthymidine as substrates for ring-closing metathesis reactions
摘要:
Thymidine derivatives containing a 4'-C-vinyl group or a 5'-C-allyl group are synthesized and used as building blocks for three different dinucleotides. These are evaluated as substrates for ring-closing metathesis cyclisations, and a protected 5'-C-allylthymidine homo-dimer is found to be the most reactive. A protected precursor for a conformationally restricted cyclic dinucleotide with a four carbon 5'-C to 5'-C connection is hereby efficiently obtained, whereas a corresponding three carbon 4'-C to 5'-C connection is obtained in a lower yield. (C) 2003 Elsevier Ltd. All rights reserved.
Dinucleotides of 4′-C-vinyl- and 5′-C-allylthymidine as substrates for ring-closing metathesis reactions
作者:Claus Kirchhoff、Poul Nielsen
DOI:10.1016/s0040-4039(03)01584-3
日期:2003.8
Thymidine derivatives containing a 4'-C-vinyl group or a 5'-C-allyl group are synthesized and used as building blocks for three different dinucleotides. These are evaluated as substrates for ring-closing metathesis cyclisations, and a protected 5'-C-allylthymidine homo-dimer is found to be the most reactive. A protected precursor for a conformationally restricted cyclic dinucleotide with a four carbon 5'-C to 5'-C connection is hereby efficiently obtained, whereas a corresponding three carbon 4'-C to 5'-C connection is obtained in a lower yield. (C) 2003 Elsevier Ltd. All rights reserved.
A cyclic dinucleotide with a four-carbon 5′-C-to-5′-C connection; synthesis by RCM, NMR-examination and incorporation into secondary nucleic acid structures
作者:Pawan K. Sharma、Birgitte H. Mikkelsen、Mikkel S. Christensen、Katrine E. Nielsen、Claus Kirchhoff、Søren L. Pedersen、Anders M. Sørensen、Kirsten Østergaard、Michael Petersen、Poul Nielsen
DOI:10.1039/b603830a
日期:——
as a substrate for a ring-closing metathesis (RCM) reaction and after deprotection, a 1 : 1 mixture of E- and Z-isomers of a cyclic dinucleotide with an unsaturated 5'-C-to-5'-C connection was obtained. Alternatively, a hydrogenation of the double bond and deprotection afforded a saturated cyclic dinucleotide. An advanced NMR-examination confirmed the constitution of this molecule and indicated a restriction