研究者詳細 - 斎藤　進

論文 - 斎藤　進

分割表示 154 件中 101 - 120 件目／全件表示 >>

Diamine-protonic acid catalysts for catalytic asymmetric aldol reaction 査読有り

S Saito, M Nakadai, H Yamamoto

SYNLETT ( 8 ) 頁： 1245 - 1248 2001年8月

Asymmetric Mannich-type reactions with a chiral acetate: effect of Lewis acid on activation of aldimine 招待有り査読有り

Saito, S; Hatanaka, K; Yamamoto, H

TETRAHEDRON 57 巻 ( 5 ) 頁： 875 - 887 2001年1月

Asymmetric Mannich-type reactions with a chiral acetate: effect of Lewis acid on activation of aldimine 査読有り

S Saito, K Hatanaka, H Yamamoto

TETRAHEDRON 57 巻 ( 5 ) 頁： 875 - 887 2001年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

We introduce here a strategy that enables effective addition of lithium enolates of acetates to aldimines. The new method depends strongly on the use of ortho-alkoxy (or ortho-fluoro) aniline-derived aldimines which found to have a potential effect on the enolate addition. This scope was expanded to the asymmetric process using the chiral acetate, which has optically pure 2,6-bis(2-isopropylphenyl)-3,5-dimethylphenol as a chiral auxiliary with axial chirality. A Lewis acid additive is likely to have a complementary role in the pronounced activation of imine functionalities in the Mannich-type addition of the bulky chiral acetate. (C) 2001 Elsevier Science Ltd. All rights reserved.

Web of Science

Polyene Synthesis via Dehydration of Hydroxyenals and -enones: HfCl4_THF_2 as an Effective Catalyst for Di-, Tri-, and Tetraene Formation 査読有り

Susumu Saito, Takashi Nagahara, Hisashi Yamamoto

Synlett 頁： 1690-1692 2001年

Novel three-component coupling using aluminum tris(2,6-diphenylphenoxide) (ATPH):: The same synthetic strategy leads to <i>trans</i>- and <i>cis</i>-jasmonates 査読有り

Saito, S; Yamazaki, S; Yamamoto, H

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 40 巻 ( 19 ) 頁： 3613 - + 2001年

Novel Three Component Coupling Using Aluminum Tris(2,6-diphenylphenoxide) (ATPH): Identical Synthetic Strategy leads to trans- and cis-jasmonates 査読有り

Susumu Saito, Satoko Yamazaki, Hisashi Yamamoto

Angew. Chem. Int. Ed. 40 巻頁： 3613-3617 2001年

Direct coupling of anilines with aryllead triacetates 査読有り

S Saito, T Kano, Y Ohyabu, H Yamamoto

SYNLETT ( 11 ) 頁： 1676 - 1678 2000年11月

Direct coupling of anilines with aryllead triacetates 招待有り査読有り

Saito, S; Kano, T; Ohyabu, Y; Yamamoto, H

SYNLETT ( 11 ) 頁： 1676 - 1678 2000年11月

Regio- and enantioselective siloxybutylation at the more hindered alpha-site of unsymmetrical ketone using chiral aluminum trisnaphthoxide 査読有り

S Saito, M Nakadai, H Yamamoto

SYNLETT ( 8 ) 頁： 1107 - 1110 2000年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：GEORG THIEME VERLAG KG

A regio- and enantioselective siloxybutylation at the more hindered alpha-site of unsymmetrical dialkyl ketones was achieved to give a quarternary carbon center by the combined use of the chiral aluminum trisnaphthoxide (R)-ATBN and a base.

Web of Science

Asymmetric Mannich-type reactions of aldimines with a chiral acetate 査読有り

Saito, S; Hatanaka, K; Yamamoto, H

ORGANIC LETTERS 2 巻 ( 13 ) 頁： 1891 - 1894 2000年6月

実用的な金属試薬、アルミニウム招待有り

斎藤　進

ファルマシア 36 巻 ( 7 ) 頁： 610-611 2000年

Aluminum Tris(2,6-diphenylphenoxide)-ArCOCl Complex for Nucleophilic Dearomatic Functionalization 査読有り

Susumu Saito, Toshihiko Sone, Masaaki Murase and Hisashi Yamamoto

J. Am. Chem. Soc. 122 巻頁： 10216-10217 2000年

Molecular Recognition of Carbonyl Compounds Using Aluminum Tris(2,6-diphenylphenoxide) (ATPH) : New Regio- and Stereoselective Alkylation of a,b-Unsaturated Carbonyl Compounds. 査読有り

Susumu Saito, Masahito Shiozawa, Takashi Nagahara, Masakazu Nakadai, and Hisashi Yamamoto

J. Am. Chem. Soc. 122 巻頁： 7847-7848 2000年

Li(I), Na(I) and K(I) Lewis Acids

Susumu Saito

Handbook on Lewis Acid, VCH & Wiley 頁： 1-67 2000年

実用的な金属試薬、アルミニウム招待有り

斎藤進

ファルマシア 36 巻 ( 7 ) 頁： 610-611 2000年

Asymmetric coupling of phenols with arylleads 査読有り

S Saito, T Kano, H Muto, M Nakadai, H Yamamoto

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 121 巻 ( 38 ) 頁： 8943 - 8944 1999年9月

Directed aldol condensation 査読有り

S Saito, H Yamamoto

CHEMISTRY-A EUROPEAN JOURNAL 5 巻 ( 7 ) 頁： 1959 - 1962 1999年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

The present article covers the progress in directed aldol condensation, which can be divided into three different classes. First, the mixed aldol condensation that uses general acids or bases under protic conditions. Second, stepwise enolization-aldolization sequence that utilizes various metal enolates under aprotic conditions. Third, a novel mixed aldol condensation that makes use of a bulky Lewis acid and a lithium amide under aprotic conditions. The scope and limitation of each of three aldol strategies is discussed.

Web of Science

Novel three component coupling of ketone, cyclic ether and epoxide using aluminum tris(2,6-diphenylphenoxide) (ATPH) 査読有り

S Saito, S Yamazaki, M Shiozawa, H Yamamoto

SYNLETT ( 5 ) 頁： 581 - 583 1999年5月

Novel three component coupling of ketone, cyclic ether and epoxide using aluminum tris(2,6-diphenylphenoxide) (ATPH) 招待有り査読有り

Saito, S; Yamazaki, S; Shiozawa, M; Yamamoto, H

SYNLETT ( 5 ) 頁： 581 - 583 1999年5月

Designer Lewis acid catalysts for selective organic synthesis 査読有り

H Yamamoto, S Saito

PURE AND APPLIED CHEMISTRY 71 巻 ( 2 ) 頁： 239 - 245 1999年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WALTER DE GRUYTER GMBH

The present paper covers the progress in stereo-, regio-, and chemoselective carbon-carbon bond-forming reactions promoted by structurally well-designed aluminum aryloxides. Compared with conventional Lewis acids, these aluminum reagents strongly coordinate with various oxygen-containing substrates, and the coordination aptitude is strongly affected by the steric environment of the metal ligands. In principle, the carbonyl groups of the bound substrates are electronically activated but sterically deactivated depending on the aluminum reagent and the type of the reaction employed. This review specifically highlights the selective organic reactions using ATPH.

Web of Science

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