Regiospecificity C(sp2)–C(sp3) Bond Construction between Purines and Alkenes to Synthesize C6-Alkylpurines and Purine Nucleosides Using O2 as the Oxidant
C–H Amination of Purine Derivatives via Radical Oxidative Coupling
作者:Zheng Luo、Ziyang Jiang、Wei Jiang、Dongen Lin
DOI:10.1021/acs.joc.8b00066
日期:2018.4.6
An oxidative coupling reaction between purines and alkyl ethers/benzyl compounds was developed to synthesize a series of N9 alkylated purine derivatives using n-Bu4NI as a catalyst and t-BuOOH as an oxidant. This protocol uses commercially available, inexpensive catalysts and oxidants and has a wide range of substrates with a simple operation.
A practical strategy for the preparation of imidazopyridine derivatives from ortho-haloaminopyridines utilizing a two-step C–N coupling/cyclization reaction sequence has been developed. This procedure provides rapid and efficient access to many medicinally interesting imidazopyridine compounds and related imidazopyrazine/purine heterocycles.
[EN] FUNCTIONALIZED NUCLEOTIDE DERIVATIVES<br/>[FR] DERIVES DE NUCLEOTIDES FONCTIONNALISES
申请人:UNIV SYDDANSK
公开号:WO2004106356A1
公开(公告)日:2004-12-09
A nucleotide derivative is disclosed, which in its 4' and/or 5' position on the sugar moiety is substituted with a group comprising a non-aromatic cyclid group comprising at least one nitrogen atom, said cyclid group optionally being substituted. The nucleotide monomer induces increased thermal stability of RNA:DNA, RNA:RNA or DNA:DNA duplexes, if said RNA and/or DNA strand comprises at least one said monomer. The nucleotides and oligonucleotides comprising at least one of said nucleotides can be used in therapy (such as antisense or antigene therapy) and in methods for synthesising polynucleotides (e.g. as a primer). The nucleotide derivative may also be used in a medicament. Further, the use of the nucleotide derivative for the preparation of a medicament for the treatment of diseases or disorders is also disclosed.
N-dimethylformamide affords the corresponding 6,6′-, 2,2′-, and 8,8′-purine dimers in high yield. Cross-dimerization reactions of different iodo derivatives were attempted, but only mixtures containing the cross-coupled products, homodimers, or dehalogenation products were obtained. The crystal structures of 9,9′-dibenzyl- (1a) and 9,9′-bis(1-methylethyl)-9H,9′H-[6,6′]bipurinyl (1c) and the salt [1aH2]Br2
[EN] PHOSPHITYLATION PROCESS<br/>[FR] PROCEDE DE PHOSPHITYLATION
申请人:AVECIA BIOTECHNOLOGY INC
公开号:WO2004035599A1
公开(公告)日:2004-04-29
A process for the phosphitylation of an alcohol or thiol with a phosphitylation agent in the presence of an activator is provided. The activator has the formula (1): wherein p is 0 or an integer from 1 to 4 and R for each occurrence is a substituent. Preferably X7 is O and p is 0. The activator is commonly employed as a salt complex with an organic base. Preferred alcohols or thiols include nucleosides and oligonucleotides. The process is particularly suited for the synthesis of phosphoramidites.