Yoshiaki Oda

Aerobic oxidation of alkanes and alkenes in the presence of aldehydes catalyzed by copper salts and copper-crown ether

The oxidation of alkanes to the corresponding alcohols and ketones and the epoxidation of alkenes can be performed efficiently at room temperature with molecular oxygen (1 atm) in the presence of an aldehyde and a copper salt catalyst such as copper(II) hydroxide. Extremely high turnover numbers have been obtained for the oxidation of cyclohexane using a combination of copper(II) chloride and a crown ether as a catalyst.

Ruthenium-catalyzed cytochrome P-450 type oxidation of alkanes with alkyl hydroperoxides

The ruthenium-catalyzed oxidation of alkanes with t-butyl hydroperoxide under mild conditions gives the corresponding ketones and alcohols highly efficiently. Kinetic study revealed that the reaction involves hydrogen abstraction of oxoruthenium species.

Fe2O3-catalyzed baeyer-villiger oxidation of ketones with molecular oxygen in the presence of aldehydes

Abstract The Fe 2 O 3 -catalyzed oxidation of ketones with molecular oxygen (1 atm) in the presence of an aldehyde at room temperature gives the corresponding lactones or esters highly efficiently.

Synthesis and stereochemistry of carnosadine, a new cyclopropyl amino acid from red alga Grateloupia carnosa

Abstract Optically active carnosadine, a new cyclopropyl amino acid from red alga Grateloupia carnosa , was synthesized and its absolute structure was determined.

Ruthenium-catalyzed oxidation of alkanes with peracids

Abstract The ruthenium-catalyzed oxidation of alkanes with peracids under mild conditions gives the corresponding ketones and alcohols highly efficiently. Similar treatment of alkanes in trifluoroacetic acid gives alkyl trifluoroacetates.

Syntheses of Four Stereoisomers of β-Methyllanthionine

Four stereoisomers of β-methyllanthionine were synthesized by coupling of N-enzyloxycarbonyl-3-methyl-D-cysteine with β-chloroalanine. 1H NMR analysis and retention time in amino acid analysis were studied on these compounds.Four stereoisomers of β-methyllanthionine were synthesized by coupling of N-enzyloxycarbonyl-3-methyl-D-cysteine with β-chloroalanine. 1H NMR analysis and retention time in amino acid analysis were studied on these compounds.

Aerobic oxidations of alkanes and alkenes in the presence of aldehydes catalysed by copper salts

Oxidation of alkanes to the corresponding alcohols and ketones and epoxidation of alkenes can be performed efficiently at room temperature with molecular oxygen (1 atm) in the presence of an aldehyde and a copper salt catalyst such as Cu(OH)2.

High Activity of Binuclear Cobalt(II) Complex for Ethylene Evolution from 1-AminocycIopropane-1-carboxylic Acid in the Presence of Hydrogen Peroxide

Abstract The binuclear Co(II) and Mn(II) complexes with H5(HXTA). where H5(HXTA) represents N,N′-(2-hydroxy-5-methyl-1,3-xylylene)bis(N-carboxymethylglycine), induced a strong ethylene evolution from 1-aminocyclopropane-l-carboxylic acid (ACC) in the presence of hydrogen peroxide, whereas activities of the corresponding Fe(III), Ni(II), and V(III) complexes were found negligible. Based on spectroscopic results and mass-spectral data it is proposed that a peroxide adduct of binuclear Co(II) (and Mn(II)) complex with η1-coordination mode interacts with ACC, which is chelated to a binuclear cobalt complex leading to facile oxidative degradation of ACC and to evolution of ethylene.

Evolution of ethylene from 1-aminocyclopropanecarboxylic acid by binuclear iron(III)-peroxide adducts

Significant ethylene evolution was observed in the reaction of 1-aminocyclopropanecarboxylic acid, binuclear iron(III) compounds and hydrogen peroxide; the origin of the ethylene is discussed in terms of the activation of peroxide ion by the binuclear iron(III) compounds.

Isolation of (S)-(+)-α-methylserine and γ-l-glutamyl-l-arginine from Sphagnum palustre

Abstract ( S )-(+)-α-Methylserine and γ- l -glutamyl- l -arginine were isolated from Sphagnum palustre . This is the first isolation of α-methylserine from the plants.