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Yoshifumi Maki

Other affiliations: Meijo University
Bio: Yoshifumi Maki is an academic researcher from Gifu Pharmaceutical University. The author has contributed to research in topics: Ring (chemistry) & Pteridine. The author has an hindex of 19, co-authored 229 publications receiving 1494 citations. Previous affiliations of Yoshifumi Maki include Meijo University.


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TL;DR: In this article, the electron-deficient olefins in the presence of palladium acetate led to the formation of the corresponding 6substituted pyrido[3,4-d]pyrimidines (4), pyridine[2,3-d]-pyrimidine (6), and quinazolines (8 and 9), respectively, via an intermediacy of azatriene.
Abstract: Oxidative-coupling of 6-azavinyl(or vinyl)-1,3-dimethyluracil derivatives (1, 5, and 7) with electron-deficient olefins in the presence of palladium acetate led to the formation of the corresponding 6-substituted pyrido[3,4-d]pyrimidines (4), pyrido[2,3-d]pyrimidines (6), and quinazolines (8 and 9), respectively, via an intermediacy of azatriene

57 citations

Journal ArticleDOI
TL;DR: The oxidative coupling of uracil derivatives t with olefins, such as methyl acrylate, acrylonitrile, methyl vinyl ketone, and styrene, using one equivalent of palladium acetate leads to the corresponding 5-(1-alkenyl)uracil derivative 2 as discussed by the authors.
Abstract: The oxidative coupling of uracil derivatives t with olefins, such as methyl acrylate, acrylonitrile, methyl vinyl ketone, and styrene, using one equivalent of palladium acetate leads to the corresponding 5-(1-alkenyl)uracil derivatives 2.

37 citations


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TL;DR: In this article, it was shown that the same alkylhydridoplatinum(IV) complex is the intermediate in the reaction of ethane with platinum(II) σ-complexes.
Abstract: ion. The oxidative addition mechanism was originally proposed22i because of the lack of a strong rate dependence on polar factors and on the acidity of the medium. Later, however, the electrophilic substitution mechanism also was proposed. Recently, the oxidative addition mechanism was confirmed by investigations into the decomposition and protonolysis of alkylplatinum complexes, which are the reverse of alkane activation. There are two routes which operate in the decomposition of the dimethylplatinum(IV) complex Cs2Pt(CH3)2Cl4. The first route leads to chloride-induced reductive elimination and produces methyl chloride and methane. The second route leads to the formation of ethane. There is strong kinetic evidence that the ethane is produced by the decomposition of an ethylhydridoplatinum(IV) complex formed from the initial dimethylplatinum(IV) complex. In D2O-DCl, the ethane which is formed contains several D atoms and has practically the same multiple exchange parameter and distribution as does an ethane which has undergone platinum(II)-catalyzed H-D exchange with D2O. Moreover, ethyl chloride is formed competitively with H-D exchange in the presence of platinum(IV). From the principle of microscopic reversibility it follows that the same ethylhydridoplatinum(IV) complex is the intermediate in the reaction of ethane with platinum(II). Important results were obtained by Labinger and Bercaw62c in the investigation of the protonolysis mechanism of several alkylplatinum(II) complexes at low temperatures. These reactions are important because they could model the microscopic reverse of C-H activation by platinum(II) complexes. Alkylhydridoplatinum(IV) complexes were observed as intermediates in certain cases, such as when the complex (tmeda)Pt(CH2Ph)Cl or (tmeda)PtMe2 (tmeda ) N,N,N′,N′-tetramethylenediamine) was treated with HCl in CD2Cl2 or CD3OD, respectively. In some cases H-D exchange took place between the methyl groups on platinum and the, CD3OD prior to methane loss. On the basis of the kinetic results, a common mechanism was proposed to operate in all the reactions: (1) protonation of Pt(II) to generate an alkylhydridoplatinum(IV) intermediate, (2) dissociation of solvent or chloride to generate a cationic, fivecoordinate platinum(IV) species, (3) reductive C-H bond formation, producing a platinum(II) alkane σ-complex, and (4) loss of the alkane either through an associative or dissociative substitution pathway. These results implicate the presence of both alkane σ-complexes and alkylhydridoplatinum(IV) complexes as intermediates in the Pt(II)-induced C-H activation reactions. Thus, the first step in the alkane activation reaction is formation of a σ-complex with the alkane, which then undergoes oxidative addition to produce an alkylhydrido complex. Reversible interconversion of these intermediates, together with reversible deprotonation of the alkylhydridoplatinum(IV) complexes, leads to multiple H-D exchange

2,505 citations

Journal ArticleDOI
Chao Liu1, Hua Zhang1, Wei Shi1, Aiwen Lei1, Aiwen Lei2 
TL;DR: Oxidative X-X Bond Formations between Two Nucleophiles 1819 5.1.
Abstract: 3.1. C-M and X-H as Nucleophiles 1806 3.2. C-H and X-M as Nucleophiles 1809 3.2.1. C-Halogen Bond Formations 1809 3.2.2. C-O Bond Formations 1812 3.3. C-H and X-H as Nucleophiles 1812 3.3.1. C-O Bond Formations 1812 3.3.2. C-N Bond Formations 1815 4. Oxidative X-X Bond Formations between Two Nucleophiles 1819 5. Conclusions 1819 Author Information 1819 Biographies 1819 Acknowledgment 1820 References 1820

1,564 citations

Journal ArticleDOI
TL;DR: This review focuses on the damage caused to DNA by reactive oxygen-centred radicals, which arise either from the radiolysis of water by ionizing radiation, or from a purely chemical source.

1,020 citations