Manabu Katsurada

Bio: Manabu Katsurada is an academic researcher from Mitsubishi Chemical Corporation. The author has contributed to research in topics: Silver perchlorate & Silylation. The author has an hindex of 4, co-authored 8 publications receiving 97 citations.

The Evaluation of Catalysts Generated from Lewis Acids and Silver Perchlorate in a Highly Stereoselective Glycosylation of 1-O-Acetyl-D-glucose

Abstract: A catalytic cycle was effectively performed in highly stereoselective glycosylation of 1-O-acetyl-D-glucose by using active species generated from respective combinations of Lewis acids (SnCl4, GeCl4, SiCl4, GaCl3, InCl3, and HfCl4) and silver perchlorate.

A Highly Stereoselective Synthesis of α-Glucosides from 1-O-Acetyl Glucose by Use of Tin(IV) Chloride–Silver Perchlorate Catalyst System

Abstract: In the presence of a catalytic amount of tin(IV) species generated from tin(IV) chloride and silver perchlorate, 1-O-acetyl-D-glucose stereoselectively reacts with silyl alkoxides to give the corresponding α-glucosides in high yields.

A Highly Stereoselective Synthesis of β-Glucosides from Pentaacylglucopyranose and Alkyl Silyl Ether by the Use of a Catalytic Amount of Active Species Generated from Methyltrichlorosilane and Silver Perchlorate

Abstract: An efficient catalytic β-glycosylation reaction starting from pentaacylglucopyranose and alkyl silyl ether was performed using an active species generated from MeSiCl3 and AgClO4. 1-O-Acetyl-2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranose stereoselectively reacted with alkyl silyl ethers with the assistance of neighboring effect to give the corresponding β-glucosides in high yields.

Thermally Reversible Photochromism of Pyrazole Derivatives

Abstract: Ethyl 4-formyl-1,3-dimethylpyrazole-5-carboxylate showed coloration upon 366-nm light irradiation in the solid state at room temperature. The red color disappeared either by melting or dissolving i...

A Highly Stereoselective Synthesis of β-Glucosides from Pentaacylglucopyranose and Alkyl Silyl Ether by the Use of a Catalytic Amount of Active Species Generated from Methyltrichlorosilane and Silver Perchlorate.

Abstract: An efficient catalytic β-glycosylation reaction starting from pentaacylglucopyranose and alkyl silyl ether was performed using an active species generated from MeSiCl3 and AgClO4. 1-O-Acetyl-2,3,4,6-tetra-O-pivaloyl-β-D-glucopyranose stereoselectively reacted with alkyl silyl ethers with the assistance of neighboring effect to give the corresponding β-glucosides in high yields.

Photochromism of organic compounds in the crystal state

Abstract: This review article deals with recent studies on organic photochromic crystals Three basic methods for the selective preparation of photochromic crystals of Schiff bases have been proposed The methodologies are applicable to a wide range of potential photochromic compounds; thus, further development of new types of photochromic solid systems can be expected In this review we introduce structures and photo-properties of recently prepared photochromic organic crystals based on proton transfer as well as other photo-induced bond formation or cleavage, along with discussion on the mechanism of their photo-coloration or photo-isomerization processes

Catalytic Glycosylations in Oligosaccharide Synthesis

Abstract: Catalytic glycosylation has been a central reaction in carbohydrate chemistry since its introduction by Fischer 125 years ago, but it is only in the past three to four decades that catalytic methods for synthesizing oligosaccharides have appeared. Despite the development of numerous elegant and ingenious catalytic glycosylation methods, only a few are in general use. This review covers all methods of catalytic glycosylation with the focus on the development and application in oligosaccharide synthesis and provide an overview of the scope and limitations of these. The review also includes relevant mechanistic studies of catalytic glycosylations. The future of catalytic glycosylation chemistry is discussed, including specific, upcoming methods and possible directions for the field of research in general.

Chemical and biochemical aspects of deoxysugars and deoxysugar oligosaccharides

Abstract: Deoxysugars and the oligosaccharides derived from them belong to one of the most important, but often most neglected, group of biological compounds. As a result of important recent progress in their chemical synthesis as well as insights into their various biochemical aspects, one can expect a major boom in the amount of research devoted to this promising field. In this chapter, the most significant aspects of the biochemistry and chemistry of deoxysugars and deoxysugar-containing oligosaccharides are discussed: (1) biosynthetic, biochemical, and molecular biological studies, including deoxygenation mechanisms, glycosyl transfer, and genes involved in biosynthesis; (2) recent experiments aimed at determining how monoor oligosaccharide moieties of bioactive natural products contribute to biological activity, i. e., the mode of action of these compounds; and (3) synthetic aspects such as chemical glycosidation and enzymatic methods for the construction of deoxysugar oligosaccharides. The information presented here is based on literature published until mid-1996.

Recent Advances in Transition Metal-Catalyzed Glycosylation

Abstract: Having access to mild and operationally simple techniques for attaining carbohydrate targets will be necessary to facilitate advancement in biological, medicinal, and pharmacological research. Even with the abundance of elegant reports for generating glycosidic linkages, stereoselective construction of α- and β-oligosaccharides and glycoconjugates is by no means trivial. In an era when expanded awareness of the impact we are having on the environment drives the state-of-the-art, synthetic chemists are tasked with developing cleaner and more efficient reactions for achieving their transformations. This movement imparts the value that prevention of waste is always superior to its treatment or cleanup. This review will highlight recent advancement in this regard by examining strategies that employ transition metal catalysis in the synthesis of oligosaccharides and glycoconjugates. These methods are mild and effective for constructing glycosidic bonds with reduced levels of waste through utilization of substo...