Tatsuya Shono
Kyoto University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Tatsuya Shono.
Tetrahedron | 1972
Tatsuya Shono; M. Mitani
Abstract Cyclic ketones were electrolytically reduced in isopropanol and in H 2 SO 4 H 2 OMeOH. It was found that, in isopropanol the stereoisomer ratios of the products were approximately equal to the thermodynamic relative stabilities, whereas in H 2 SO 4 H 2 OMeOH the thermodynamically unstable epimeric alcohols formed were more than that anticipated from the relative stabilities. The mechanism of this electroreduction involving the stereoselective adsorption and electron transfer is discussed.
Tetrahedron Letters | 1980
Tatsuya Shono; Hiroshi Ohmizu; Souta Kawakami; Hiroshi Sugiyama
Abstract Electroreductive crossed hydrocoupling of α,β-unsaturated esters with aldehydes or ketones in the presence of trimethylchlorosilane afforded γ-lactones in good yields. Similarly, α,β-unsaturated nitriles gave γ-hydroxynitriles in high yields.
Tetrahedron Letters | 1987
Tatsuya Shono; Yoshihiro Matsumura; Osamu Onomura; Yasufu Yamada
Abstract 2-Substituted 1,2-dihydropyridines including an optically active one were regioselectively prepared from 2-substituted piperidines through three intermediates, that is, (a) 1,2,3,4-tetrahydropyridines, (b) 5-bromo-6-methoxypiperidines, and (c) 1,2,3,6-tetrahydro- 6-methoxypyridines.
Tetrahedron Letters | 1983
Tatsuya Shono; auYoshihiro Matsumura; Takenobu Kanazawa
Abstract (±)-Conhydrine, (±)-ephedrine, and (±)-N-methylephedrine have been synthesized with a complete stereochemical control by utilizig carbanions in which the negative charge is located at the position α to the nitrogen atom of N-acylamines.
Tetrahedron Letters | 1981
Tatsuya Shono; Yoshihiro Matsumura; Kenji Tsubata
Abstract A new carbon—phosphorous bond forming reaction, that is, the reaction of α-methoxyurethanes with trialkyl phosphites in the presence of Lewis acid catalysts was studied on twelve examples.
Tetrahedron Letters | 1980
Tatsuya Shono; Yoshihiro Matsumura; Jue Hayashi; Mikiko Mizoguchi
Abstract The electrochemical oxidation of alcohols was accomplished by using a double mediatory system in which both alkyl methyl sulfide and bromide act in concert as mediators.
Tetrahedron Letters | 1990
Tatsuya Shono; Naoki Kise
Abstract Electroreduction of γ- and δ-cyanoketones in i-PrOH gave cyclized products α-hydroxyketones and their dehydroxylated ketones, and this reaction was applied to the synthesis of dihydrojasmone, methyl dihydrojasmonate, and Rosaprostol.
Tetrahedron Letters | 1981
Tatsuya Shono; Yoshihiro Matsumura; Kenji Tsubata
Abstract Reaction of α-methoxyurethanes with phenylisocyanide gave the corresponding amides of α-amino acid in reasonable yields.
Tetrahedron | 1974
Tatsuya Shono; I. Nishiguchi
Abstract Homolytic aromatic substitution and hydrogen abstraction reactions with cyclopropyl radical were carried out to determine the reactivity and ionic character of cyclopropyl radical by examination of the orientation effect, partial rate factor and influence of substituents. By thermal decomposition of biscyclopropaneformyl peroxide in a series of substituted benzenes, the corresponding cyclopropylated benzene derivatives (the mixture of ortho, meta and para isomers) were obtained in moderate yield. In view of the orientation effect and the partial rate factor, the cyclopropyl radical seems to be fairly free from polar effect, and to resemble the phenyl radical more than the common alkyl radical although the cyclopropyl radical has a slightly higher reactivity than the phenyl radical. The relative reactivity of the 2-phenylcyclopropyl radical in the hydrogen abstraction reaction toward the benzylic position of ring-substituted toluenes gave good Hammetts correlation with the slope of + 0·20 suggesting little ionic character in the transition state. This result was in good agreement with the conclusion obtained from homolytic aromatic substitution reaction and with the chemical reactivity to be expected from the non-planar nearly sp 2 -hybridized conformation of the cyclopropyl radical.
Journal of The Chemical Society, Chemical Communications | 1992
Tatsuya Shono; Shigenori Kashimura; Hiroaki Murase
Formation of Ge–Ge and Ge–Si bonds has been achieved by electroreduction with an Mg electrode and this method has been successfully applied to the preparation of polygermane and germane–silane copolymer.