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.
Construction of a Pyrimidine Framework through [3 + 2 + 1] Annulation of Amidines, Ketones, and <i>N</i>,<i>N</i>-Dimethylaminoethanol as One Carbon Donor
作者:Zemin Qin、Yongmin Ma、Fanzhu Li
DOI:10.1021/acs.joc.1c01847
日期:2021.10.1
synthesis of pyrimidinederivatives has been developed. It involves a [3 + 2 + 1] three-component annulation of amidines, ketones, and one carbon source. N,N-Dimethylaminoethanol is oxidized through C(sp3)–H activation to provide the carbon donor. One C–C and two C–N bonds are formed during the oxidative annulation process. The reaction shows good tolerance to many important functional groups in air, making
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.