Silver-Catalyzed Direct C6-H Arylation of Purines and Purine Nucleosides with Arylboronic Acids
作者:Miao Tian、Mingwu Yu、Tingting Shi、Junbin Hu、Shunlai Li、Jiaxi Xu、Ning Chen、Hongguang Du
DOI:10.1002/ejoc.201700406
日期:2017.6.30
An efficient protocol for the direct C6–H arylation of purines and purine nucleosides is described under the catalysis of silver nitrate and under ambient conditions. A wide assortment of purines and arylboronic acids can be employed in this process to afford C6‐arylpurines and purine nucleosides with high regioselectivity. TFA = trifluoroacetic acid; DCE = 1,2‐dichloroethane.
Regioselective C<sup>6</sup>–H Hydroxyalkylation of Purines and Purine Nucleosides via α-C–H Functionalization of Alcohols at Room Temperature
作者:Mingwu Yu、Zheng Zhou、Yiwen Chen、Zhichuan Wang、Weili Wang、Kai Sun
DOI:10.1021/acs.orglett.2c01680
日期:2022.7.15
The highly regioselective C6–H hydroxylalkylation of purines and purine nucleosides within 10 min via the α-C(sp3)–H functionalization of alcohols at room temperature is reported here for the first time. The reaction tolerated various functional groups, which have the potential for further modification to afford other valuable molecules. The reported method avoids metal catalysts, light, and protecting
A mild and practical protocol for highly regioselective C6−Halkylation of purines with alcoholsintervened by oxalates under blue LED irradiation is reported. This transformation does not need transition metalcatalysts, is not sensitive to moisture and does not require N2 protection. Besides, this method displays broad functional groups compatibility and is easily scale up.
报告了一种温和实用的方案,用于在蓝色 LED 照射下草酸盐干预嘌呤与醇的高度区域选择性 C6-H 烷基化。这种转化不需要过渡金属催化剂,对水分不敏感,也不需要N 2保护。此外,该方法显示出广泛的功能组兼容性并且易于放大。
Photocatalyst-free visible-light-induced highly selective acylation of purine nucleosides at the C6 position
A protocol for visible-light-induced C–H acylation selectively at the C6 position of purine nucleosides with aldehydes under photocatalyst-free conditions was established herein. This protocol allows the green, mild, and efficient functionalization of various purine nucleosides with a broad range of alkyl and aryl aldehydes.
Metal-free direct C-6–H alkylation of purines and purine nucleosides enabled by oxidative homolysis of 4-alkyl-1,4-dihydropyridines at room temperature
Herein we report the application of 4-alkyl-1,4-dihydropyridines (DHPs), which are easily prepared from inexpensive aldehydes in one step, for the direct site-specific C–H alkylation of purines and purine nucleosides. Despite there being three active C(sp2)–H bonds (C-2–H, C-6–H, and C-8–H) in the structure, the reactions still show high regioselectivity at the purinyl C-6–H position. Importantly,