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。
Light, metal‐free regioselective<scp>C<sup>6</sup>‐H</scp>alkylation of purines and purine nucleosides with alcohols
A metal-, light-free radical alkylation reaction of purines and nucleosides has been achieved with readily available alcohols (1°, 2°, 3°) as the alkyl radical sources enabled by oxalates, which does not need any catalysts, N2 protection, and protecting groups. Although there are three potential active C(sp2)H bonds and four interferential nitrogen atoms in the purine motif, the reaction still shows
以草酸盐为烷基自由基源,以易得的醇(1°、2°、3°)实现了嘌呤和核苷的金属、光自由基烷基化反应,不需要任何催化剂、N 2保护和保护基团。尽管嘌呤基序中存在3个潜在的活性C( sp 2 ) H键和4个干扰氮原子,但该反应在C 6 H位上仍然表现出优异的区域选择性,并且不存在多烷基化问题。此外,该方法表现出广泛的功能组耐受性,并且可扩展至克级,可应用于后期 C 嘌呤的 H 烷基化合成具有抗 CEM 活性的 6-环戊基星云碱,从而证明了其实用性。
Regiospecificity C(sp<sup>2</sup>)–C(sp<sup>3</sup>) Bond Construction between Purines and Alkenes to Synthesize C<sup>6</sup>-Alkylpurines and Purine Nucleosides Using O<sub>2</sub> as the Oxidant
作者:Mingwu Yu、Qingsong Jiang、Xiguang Liu、Yiwen Chen、Kai Sun、Miao Tian、Weili Wang