Synthesis of amino acids and related compounds. 42. A novel transformation of imidazolines into 2,4,6-trisubstituted pyrimidine derivatives
摘要:
2,5-Diaryl-4-(chloromethyl)imidazoline derivatives 5a-g, obtained from N-acyl-alpha-amino ketone derivatives 1, were rearranged with sodium hydride in dimethylformamide. Spontaneous air oxidation led to 2,4-di- and 2,4,6-triarylpyrimidine derivatives 6a-g in good yields.
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
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
One-Pot Double Suzuki Couplings of Dichloropyrimidines
作者:Scott Handy、Samantha Anderson
DOI:10.1055/s-0030-1258150
日期:2010.8
An effective one-pot, regioselective double Suzuki coupling of 2,4-dichloropyrimidine has been developed, which enables the quick and efficient synthesis of diarylated pyrimidines. The choice of solvent proved critical to the success of this reaction sequence, with alcoholic solvent mixtures affording much greater reactivity and requiring correspondingly lower temperatures than the use of polar aprotic solvents.
polysubstituted pyrimidines are smoothly formed via a base-promoted intermolecular oxidation C–N bond formation of allylic C(sp3)–H and vinylic C(sp2)–H of allyllic compounds with amidines using O2 as the soleoxidant. This protocol features protecting group free nitrogen sources, good functional group tolerance, high atom economy, and environmental advantages.