Iron Catalysis for Modular Pyrimidine Synthesis through β-Ammoniation/Cyclization of Saturated Carbonyl Compounds with Amidines
作者:Xue-Qiang Chu、Wen-Bin Cao、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1021/acs.joc.6b02767
日期:2017.1.20
method for the modular synthesis of various pyrimidine derivatives by means of the reactions of ketones, aldehydes, or esters with amidines in the presence of an in situ prepared recyclable iron(II)-complex was developed. This operationally simple reaction proceeded with broad functionalgroup tolerance in a regioselective manner via a remarkable unactivated β-C–H bond functionalization. Control experiments
Cu-Catalyzed [3 + 3] Annulation for the Synthesis of Pyrimidines via β-C(sp<sup>3</sup>)–H Functionalization of Saturated Ketones
作者:Jun-Long Zhan、Meng-Wei Wu、Fei Chen、Bing Han
DOI:10.1021/acs.joc.6b02181
日期:2016.12.2
A novel, efficient, and facile approach for the synthesis of structurally important pyrimidines has been successfully developed by Cu-catalyzed and 4-HO-TEMPO-mediated [3 + 3] annulation of commercially available amidines with saturated ketones. This method provides a new protocol for the synthesis of pyrimidines by a cascade reaction of oxidative dehydrogenation/annulation/oxidative aromatization
I<sub>2</sub>-Catalyzed Aerobic α,β-Dehydrogenation and Deamination of Tertiary Alkylamines: Highly Selective Synthesis of Polysubstituted Pyrimidines via Hidden Acyclic Enamines
β-dehydrogenation and deamination of tertiary alkylamines. This I2-catalyzed dehydrogenative multicomponent procedure utilizes simplealdehydes to trap the hidden enamine intermediates and suspend generation of azadienes from amidines, enabling the difunctionalization of a vicinal C(sp3)–H bond. These studies provide valuable possibilities for the introduction of aliphatic substituents and show how to
A selective, nonchelation‐assisted methylation of arenes has been developed. The overall transformation, which combines a C−H functionalization reaction with a nickel‐catalyzed cross‐coupling, offers rapid access to methylated arenes with high para selectivity. The reaction is amenable to late‐stage methylation of small‐molecule pharmaceuticals.