Synthesis of (purin-6-yl)acetates and 6-(2-hydroxyethyl)purines via cross-couplings of 6-chloropurines with the Reformatsky reagent
作者:Zbyněk Hasník、Peter Šilhár、Michal Hocek
DOI:10.1016/j.tetlet.2007.06.053
日期:2007.8
A novel approach to the synthesis of 6-(2-hydroxyethyl)purines was developed based on Pd-catalyzed cross-coupling reactions of 6-chloropurines with the Reformatsky reagent followed by reduction by NaBH4 and treatment with MnO2. This methodology was successfully applied to the syntheses of 6-(ethoxycarbonylmethyl)- and 6-(hydroxyethyl)purine bases and nucleosides.
Straightforward and Highly Efficient Catalyst-Free One-Step Synthesis of 2-(Purin-6-yl)acetoacetic Acid Ethyl Esters, (Purin-6-yl)acetates, and 6-Methylpurines through S<sub>N</sub>Ar-Based Reactions of 6-Halopurines with Ethyl Acetoacetate
synthesis of purines bearing functionalized carbon substituents or methyl in position 6 was developed. Under different reaction conditions, 6-halopurine derivatives could react with ethyl acetoacetate efficiently to yield 2-(purin-6-yl)acetoaceticacid ethyl esters, (purin-6-yl)acetates and 6-methylpurines respectively. No metal catalyst and ligand were required.