Synthesis of<i>N</i>-Alkenylpurines by Rearrangements of the Corresponding<i>N</i>-Allyl Isomers: Scopes and Limitations
作者:Jindrich Kania、Lise-Lotte Gundersen
DOI:10.1002/ejoc.201201455
日期:2013.4
N-7-alkenylpurines have been synthesized by rearrangement of the corresponding N-allyl derivatives, often in good yields and with high stereoselectivity. Base promoted and transition metal mediated rearrangements have been studied. Simple allylpurines were easily rearranged with catalytic amounts of RuClH(CO)(PPh3)3. The efficiency of base promoted rearrangement was highly dependent on the detailed structure
N-9- 和 N-7- 烯基嘌呤是通过相应的 N-烯丙基衍生物的重排合成的,通常具有良好的产率和高立体选择性。已经研究了碱促进和过渡金属介导的重排。简单的烯丙基嘌呤很容易与催化量的 RuClH(CO)(PPh3)3 重排。碱促进重排的效率高度依赖于起始材料的详细结构,但这种反应经常以惊人的高 Z 选择性发生。
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.
An efficient and mild method has been developed for the preparation of 9-oxiranyl-9H-purine derivatives. This reaction proceeds smoothly in beta-cyclodextrin cavity at room temperature, giving good to excellent yields. (C) 2014 Elsevier Ltd. All rights reserved.