Selective Functionalisation of 5-Methylcytosine by Organic Photoredox Catalysis

被引:5
作者
Simpson, Mathew M. [1 ]
Lam, Ching Ching [1 ]
Goodman, Jonathan M. [1 ]
Balasubramanian, Shankar [2 ,3 ]
机构
[1] Univ Cambridge, Yusuf Hamied Dept Chem, Lensfield Rd, Cambridge CB2 1EW, England
[2] Univ Cambridge, Cambridge Inst Li Ka Shing Ctr, Canc Res, Robinson Way, Cambridge CB2 0RE, England
[3] Univ Cambridge, Sch Clin Med, Cambridge CB2 0SP, England
基金
英国惠康基金;
关键词
C-H Functionalization; Nucleic Acids; Photocatalysis; Radicals; Reaction Mechanisms; DNA; RESIDUES;
D O I
10.1002/anie.202304756
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The epigenetic modification 5-methylcytosine plays a vital role in development, cell specific gene expression and disease states. The selective chemical modification of the 5-methylcytosine methyl group is challenging. Currently, no such chemistry exists. Direct functionalisation of 5-methylcytosine would improve the detection and study of this epigenetic feature. We report a xanthone-photosensitised process that introduces a 4-pyridine modification at a C(sp(3))-H bond in the methyl group of 5-methylcytosine. We propose a reaction mechanism for this type of reaction based on density functional calculations and apply transition state analysis to rationalise differences in observed reaction efficiencies between cyanopyridine derivatives. The reaction is initiated by single electron oxidation of 5-methylcytosine followed by deprotonation to generate the methyl group radical. Cross coupling of the methyl radical with 4-cyanopyridine installs a 4-pyridine label at 5-methylcytosine. We demonstrate use of the pyridination reaction to enrich 5-methylcytosine-containing ribonucleic acid.
引用
收藏
页数:7
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