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Synthesis of 2-substituted pyrimidines and benzoxazoles via a visible-light-driven organocatalytic aerobic oxidation: enhancement of the reaction rate and selectivity by a base
Palladium-Catalyzed Copper-Promoted Hiyama-Type Carbon–Carbon Cross-Coupling Reactions of Dihetaryl Disulfides as Electrophiles
作者:Zheng-Jun Quan、Xi-Cun Wang、Ming-Xia Liu、Hai-Peng Gong
DOI:10.1055/s-0036-1589116
日期:2018.2
Dihetaryl disulfides were used as electrophiles in a palladium-catalyzed carbon–carbon cross-coupling reaction with arylsilanes to realize a Hiyama-type reaction. This unique transformation shows high reactivity, excellent functional-group tolerance, and mild reaction conditions, making it an attractive alternative to conventional cross-coupling approaches for carbon−carbon bond construction.
Mild and efficient oxidative aromatization of 4-substituted-1,4-dihydropyrimidines using (diacetoxyiodo)benzene
作者:Nandkishor N. Karade、Sumit V. Gampawar、Nilesh P. Tale、Sanjay B. Kedar
DOI:10.1002/jhet.389
日期:——
4‐Alkyl or aryl‐1,4‐dihydropyrimidines were readily oxidized by (diacetoxyiodo)benzene under mild reaction conditions to the corresponding pyrimidine derivatives in good to excellent yields. J. Heterocyclic Chem., (2010).
Aerobic copper-promoted oxidative dehydrosulfurative carbon–oxygen cross-coupling of 3,4-dihydropyrimidine-1<i>H</i>-2-thiones with alcohols
作者:Jihong Lee、Yujeong Kwon、Dong-Chan Lee、Jeong-Hun Sohn
DOI:10.1039/d1ra07713a
日期:——
A wide range of readily available DHPMs and alcohols makes the presented reaction an attractive method to access biologically valuable 2-alkoxypyrimidine derivatives with rapid diversification.
Palladium-catalyzed dehydrogenation of dihydro-heterocycles using isoprene as the hydrogen acceptor without oxidants
作者:Xiao-Jun Liu、Wen-Peng Wang、Cong-De Huo、Xi-Cun Wang、Zheng-Jun Quan
DOI:10.1039/c6cy02038k
日期:——
efficient and general method for Pd-catalyzed dehydrogenative aromatization of dihydro-heteroatom compounds without external O2 and H2 is first described. The protocol firstly uses isoprene as a hydrogenacceptor. Various dihydro-heterocycles including dihydropyrimidinones, dihydropyrimidines and dihydropyridines can be dehydrogenated to produce the corresponding aromatic heterocyclic compounds.
irradiation (λ > 400 nm) of rhenium(I) complexes (P1−P4), a photochemical conversion from 3,4-dihydropyrimidin-2(1H)-ones to pyrimidin-2(1H)-ones at room temperature has been achieved with good to excellent yields in CH3CN−H2O solution containing CCl4 and K2CO3. Luminescence quenching study and product analysis reveal that photoinduced electron transfer between rhenium(I) complex P and 3,4-dihydropyrimidin-2(1H)-ones