Solid-liquidPTC without added organic solvent promotes alkylation of purine derivatives leading in particular to an efficient synthesis of the antiviral DHPA. The location of the substituent on the ring was determined by analysis of coupling interactions through 2D δ-δ heteronuclear 1H 13C correlated NMR spectroscopy.
不添加有机溶剂的固液PTC促进嘌呤衍生物的烷基化,尤其导致抗病毒DHPA的有效合成。环上取代基的位置是通过2Dδ-δ杂核1 H 13 C相关NMR光谱分析耦合相互作用来确定的。
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。
A new route to acyclic nucleosides via palladium-mediated allylic alkylation and cross-metathesis
作者:Franck Amblard、Steven P. Nolan、Isabelle Gillaizeau、Luigi A. Agrofoglio
DOI:10.1016/j.tetlet.2003.10.029
日期:2003.12
A method for the syntheses of E-unsaturated acyclic nucleosides via a combination of palladium-catalyzed allylic alkylation and ruthenium-based crossmetathesis is described. This approach provides a concise, efficient and reliable route to new nucleoside analogues.
AbstractA simple and efficient protocol for the preparation of N 7-substituted adenines, guanines, and 6-mercaptopurines is described. The key step is the regioselective preparation of 7-substituted 6-chloropurines which are building blocks for the divergent synthesis of adenines, guanines, and 6-mercaptopurines by known procedures. Graphical abstract
Synergistic Organoboron/Palladium Catalysis for Regioselective N-Allylations of Azoles with Allylic Alcohols
作者:Matthew T. Zambri、Teh Ren Hou、Mark S. Taylor
DOI:10.1021/acs.orglett.2c03084
日期:2022.10.21
A method for regioselective palladium-catalyzed allylic alkylation of ambident nitrogen heterocycles, employing simple allylicalcohols as electrophile precursors, is described. An organoboron co-catalyst serves both to activate the azole-type nucleophile toward selective N-functionalization and to accelerate the formation of a π-allylpalladium complex from the allylicalcohol. The method can be applied
描述了一种使用简单的烯丙醇作为亲电体前体的区域选择性钯催化烯丙基烷基化环氮杂环的方法。有机硼助催化剂既可以激活唑类亲核试剂以实现选择性 N 官能化,又可以加速烯丙醇形成 π-烯丙基钯络合物。该方法可以应用于各种杂环类型,包括 1,2,3-和 1,2,4-三唑、四唑、吡唑和嘌呤,并且可以扩展到取代的烯丙醇伙伴。