C-5 Modified Nucleosides: Direct Insertion of Alkynyl-Thio Functionality in Pyrimidines
摘要:
A route is presented to append, in a single step, alkynyl thioesters to the 5-position of a pyrimidine ring of a nucleoside that is unprotected. These products should be useful to support in vitro selection experiments with functionalized DNA.
2‘-Deoxycytidines Carrying Amino and Thiol Functionality: Synthesis and Incorporation by Vent (Exo<sup>-</sup>) Polymerase
作者:Abhijit Roychowdhury、Heshan Illangkoon、Cynthia L. Hendrickson、Steven A. Benner
DOI:10.1021/ol0360290
日期:2004.2.1
[reaction: see text] The synthesis of 2'-deoxycytidine nucleosides bearing amino and thiol groups appended to the 5-position of the nucleobase via a butynyl linker is described. The corresponding triphosphates were then synthesized from the nucleoside and incorporated into oligonucleotides by Vent (exo(-)) DNA polymerase. The ability of Vent (exo(-)) polymerase to amplify oligonucleotides containing
Enyne Metathesis: A Catalytic, Cross-Selective Diene Synthesis
作者:Steven T. Diver、Anthony J. Giessert
DOI:10.1055/s-2003-44375
日期:——
Methods for the synthesis of 1,3-dienes by intermolecular enyne metathesis are described. A brief overview of enyne metathesis is provided with a discussion of the scope and limitations with respect to reactants and catalyst. The surge of recent interest in metathesis generally and the cross enyne metathesis specifically, has closely matched the development of the functional group-tolerant Grubbs’ carbene catalysts.
作者:Anthony J. Giessert、Nicholas J. Brazis、Steven T. Diver
DOI:10.1021/ol035270b
日期:2003.10.1
[GRAPHICS]Intermolecular enyne metathesis between functional group-rich alkynes and vinyl ethers was promoted by ethylene cometathesis. The concentration of ethylene was optimized to suppress the competing formation of butadiene through background ethylene metathesis. The role of ethylene appears to be both protective and rate enhancing.
Attempts at vinyl radical carbonylation through cyclization onto carbonyl and cyano groups
作者:Pier Carlo Montevecchi、Maria Luisa Navacchia、Piero Spagnolo
DOI:10.1016/s0040-4020(98)00458-x
日期:1998.7
Sulfanylvinyl radicals 4–6, 16, produced from toluenesulfanyl radical addition to alkynes 1–3, 15, gave only products arising from cyclizationonto the thiophenyl ring and H-abstraction. No products were obtained deriving from possible 5-membered cyclizationonto the esteric or thioesteric carbonyl group. Similar results were obtained from toluenesulfanyl radical addition to alkynyl nitriles 20 and
C-5 Modified Nucleosides: Direct Insertion of Alkynyl-Thio Functionality in Pyrimidines
作者:Heike A. Held、Abhijit Roychowdhury、Steven A. Benner
DOI:10.1081/ncn-120022030
日期:2003.7.1
A route is presented to append, in a single step, alkynyl thioesters to the 5-position of a pyrimidine ring of a nucleoside that is unprotected. These products should be useful to support in vitro selection experiments with functionalized DNA.