6-Bromopurine Nucleosides as Reagents for Nucleoside Analogue Synthesis
作者:Eduardo A. Véliz、Peter A. Beal
DOI:10.1021/jo016078v
日期:2001.12.1
Surprisingly facile direct substitution reactions with acetyl-protected 6-bromopurine nucleosides are described. Included in the series of bromonucleosides studied is the guanosine derivative N(2)-2',3',5'-tetraacetyl-6-bromopurine ribonucleoside, the synthesis of which is reported here for the first time. Brominated nucleosides had not previously been considered optimal substrates for S(N)Ar reactions given
Synthesis of N6,N6-Dialkyladenine Nucleosides Using Hexaalkylphosphorus Triamides Produced in Situ
作者:Mahesh K. Lakshman、Asad Choudhury、Suyeal Bae、Eliezer Rochttis、Padmanava Pradhan、Amit Kumar
DOI:10.1002/ejoc.200800752
日期:——
Reactions between secondary amines and phosphorus trichloride (PCl3) leads to the formation of the corresponding tris(dialkylamino)phosphines or hexaalkylphosphorus triamides [HAPT: (R2N)3P]. Reaction of silyl-protected 2'-deoxyinosine and acetyl-protected inosine with the in situ formed HAPT and iodine (I2) leads to the formation of N6,N6-dialkyl adenosine and 2'-deoxyadenosine. In some cases the
A Highly Facile and Efficient One-Step Synthesis of <i>N</i><sup>6</sup>-Adenosine and <i>N</i><sup>6</sup>-2‘-Deoxyadenosine Derivatives
作者:Zhao-Kui Wan、Eva Binnun、Douglas P. Wilson、Jinbo Lee
DOI:10.1021/ol052424+
日期:2005.12.1
[reaction: see text] A highly facile and efficient one-stepsynthesis of N6-adenosine and N6-2'-deoxyadenosine derivatives has been developed. Treatment of inosine or 2'-deoxyinosine, without protection of sugar hydroxyl groups, with alkyl or arylamines, in the presence of BOP and DIPEA in DMF, led to the formation of N6-adenosine and N6-2'-deoxyadenosine derivatives in good to excellent yields. Carcinogenic
Mild and Efficient Functionalization at C6 of Purine 2‘-Deoxynucleosides and Ribonucleosides<sup>1</sup>
作者:Xiaoyu Lin、Morris J. Robins
DOI:10.1021/ol000255h
日期:2000.11.1
[reaction: see text] Treatment of sugar-protected inosine and 2'-deoxyinosine derivatives with a cyclic secondary amine or imidazole and I(2)/Ph(3)P/EtN(i-Pr)(2)/(CH(2)Cl(2) or toluene) gave quantitative conversions into 6-N-(substituted)purine nucleosides. S(N)Ar reactions with 6-(imidazol-1-yl) derivatives gave 6-(N, O, or S)-substituted products. The 6-(benzylsulfonyl) group underwent S(N)Ar displacement