Selective Chemical Functionalization at N6-Methyladenosine Residues in DNA Enabled by Visible-Light-Mediated Photoredox Catalysis
作者:Manuel Nappi、Alexandre Hofer、Shankar Balasubramanian、Matthew J. Gaunt
DOI:10.1021/jacs.0c10616
日期:2020.12.23
Selective chemistry that modifies the structure of DNA and RNA is essential to understanding the role of epigenetic modifications. We report a visible-light-activated photocatalytic process that introduces a covalent modification at a C(sp3)-H bond in the methyl group of N6-methyl deoxyadenosine and N6-methyl adenosine, epigenetic modifications of emerging importance. A carefully orchestrated reaction
修饰 DNA 和 RNA 结构的选择性化学对于理解表观遗传修饰的作用至关重要。我们报告了一种可见光激活的光催化过程,该过程在 N6-甲基脱氧腺苷和 N6-甲基腺苷的甲基 C(sp3)-H 键上引入共价修饰,这是新兴重要性的表观遗传修饰。精心策划的反应结合了硝基吡啶的还原反应,形成亚硝基吡啶自旋捕获剂,以及精确选择性的叔胺介导的 N6-甲基上的氢原子抽象,形成 α-氨基自由基。假定的 α-氨基自由基与亚硝基吡啶交叉偶联产生稳定的缀合物,在 N6-甲基-腺苷上安装标签。我们证明,可以从复杂的混合物中富集含 N6-甲基脱氧腺苷的寡核苷酸,这为识别基因组 DNA 和 RNA 中的这种修饰的应用铺平了道路。
[EN] GSK-3 INHIBITORS<br/>[FR] INHIBITEURS DE GSK-3
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2018098411A1
公开(公告)日:2018-05-31
The disclosure generally relates to compounds of formula (I), including their salts, as well as compositions and methods of using the compounds to treat disorders associated with GSK-3.
作者:Einar J. Andreassen、Jan M. Bakke、Ingrid Sletvold、Harald Svensen
DOI:10.1039/b408840a
日期:——
3-Nitropyridine and 4-substituted-3-nitropyridines were reacted with chloroform, methyl chloroacetate and ethyl 2-chloropropionate under vicarious nucleophilic substitution (VNS) conditions. Substitution was obtained in the ortho or para position to the nitro group with acceptable to good yields and regioselectivity. With potassium 5-nitropyridine-2-sulfonate the substitution took place in the 4-position. Further substitution of the sulfonate group proved to be possible.
Preparation of 4-substituted 3-amino-2-chloropyridines, synthesis of a nevirapine analogue
作者:J. M. Bakke、J. Riha
DOI:10.1002/jhet.5570380114
日期:2001.1
new method for preparing 3-amino-2-chloropyridines with a substituent (methyl, phenyl, carbox-amide, methoxycarbonyl, acetyl, benzoyl and cyano) at the 4-position has been developed. An isoquinoline analogue of the reverse transcriptase inhibitor Nevirapine has been synthesized from the 4-amino-3-chloroisoquinoline.
Photocontrol over Cooperative Porphyrin Self-Assembly with Phenylazopyridine Ligands
作者:Takashi Hirose、Floris Helmich、E. W. Meijer
DOI:10.1002/anie.201205085
日期:2013.1.2
The cooperative self‐assembly of chiral zinc porphyrins is regulated by a photoresponsive phenylazopyridineligand (1; see picture). Porphyrin stacks depolymerize into dimers upon axial ligation and the strength of the coordination is regulated by its photoinduced isomerization, which shows more than 95 % conversion ratio for both photostationary states.