[reaction: see text] A facile and efficient methodology of the synthesis of 6-(hydroxymethyl)purine derivatives (bases and nucleosides) was developed based on Pd-catalyzed cross-coupling reactions of 6-halopurines with acyloxymethylzinc iodides followed by deprotection. Several title compounds are inhibitors of adenosine deaminase and exert cytostatic activity.
The invention provides methods for reversibly inhibiting stem cell differentiation wherein a compound of formula (I) is contacted with a stem cell. The invention further provides a method for preparing a culture medium, a culture medium supplement and a composition comprising a compound of formula (I).
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
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,