Ryukichi Takagi

发表

Synthesis of a 4,5-epoxy-2-cyclohexen-1-one derivative via epoxide ring opening, 1,3-carbonyl transposition and epoxide ring regeneration: a synthetic study on a scyphostatin analogue.

Ryukichi Takagi, K. Tojo, Masato Iwata, 2005, Organic & biomolecular chemistry.

Disulfonimide catalyzed asymmetric intramolecular hydroamination of alkenyl thioureas: Concentration effect in the hydroamination

Ryukichi Takagi, D. T. Duong, Toshiya Ichiki, 2021, Tetrahedron.

Computational study on N-triflylphosphoramide-catalyzed enantioselective hydroamination of alkenyl thiourea.

Ryukichi Takagi, D. T. Duong, 2021, Organic & biomolecular chemistry.

Formation of Isomerized E , Z -Configured 1,3-Dienes in Construction of Macrocyclic Trienes by Diene-Ene RCM

S. Kojima, Ryukichi Takagi, Y. Hiraga, 2015 .

Loliolide and Other Germination Inhibitory Active Constituents in Equisetum Arvense

Ryukichi Takagi, K. Ohkata, Y. Hiraga, 1997 .

[3+2] Cycloaddition of α,β‐Unsaturated Metal–Carbene Complexes

Ryukichi Takagi, M. Abe, 2014 .

A novel non-metathetic behavior of Grubbs catalyst: Ruthenium-mediated intramolecular [3 + 2] cycloaddition of bis-1,3-dienes

S. Kojima, Ryukichi Takagi, Y. Hiraga, 2013 .

Zirconium-catalyzed chemoselective methylalumination of ethers, amines, and sulfides bearing two terminal alkenyl groups

S. Kojima, N. Igata, Ryukichi Takagi, 2011 .

Alkylalumination of arylacetylene catalyzed by zirconocene catalysts supported on solid materials

S. Kojima, N. Igata, Ryukichi Takagi, 2010 .

Bis(trifluoromethanesulfonimide) (BSI): Acidity and application to hydrofunctionalization as a Brønsted acid catalyst

Ryukichi Takagi, D. T. Duong, Y. Sakai, 2021 .

Artocarmins G-M, Prenylated 4-Chromenones from the Stems of Artocarpus rigida and Their Tyrosinase Inhibitory Activities.

N. Nguyen, P. Dang, M. T. T. Nguyen, 2017, Journal of natural products.

Rate acceleration of phosphoric acid-catalyzed Diels-Alder reaction by internal hydrogen-bonding of adjacent hydroxy group

Ryukichi Takagi, K. Ohkata, Asako Kondo, 2007 .

Stereochemical considerations on the stereoselective cyclopropanation reactions of 3-aryl-2-phosphonoacrylates induced by the (−)-8-phenylmenthyl group as a chiral auxiliary

S. Kojima, S. Begum, Ryukichi Takagi, 2002 .

Stereochemical investigation on the construction of poly-functionalized bicyclo[3.3.1]nonenones by successive Michael reactions of 2-cyclohexenones.

Ryukichi Takagi, K. Ohkata, Y. Inoue, 2007, Organic & biomolecular chemistry.

The Juliá-Colonna Asymmetric Epoxidation Reaction of Chalcone Catalyzed by Length Defined Oligo-L-leucine: Importance of the N-Terminal Functional Group and Helical Structure of the Catalyst in the Asymmetric Induction

S. Kojima, Ryukichi Takagi, K. Ohkata, 2000 .

The Juliá-Colonna Type Asymmetric Epoxidation Reaction Catalyzed by Soluble Oligo-L-leucines Containing an α-Aminoisobutyric Acid Residue: Importance of Helical Structure of the Catalyst on Asymmetric Induction

S. Kojima, Ryukichi Takagi, K. Ohkata, 2000 .

Enantioselective Michael Reaction of Cyclic β-Ketoesters with Morita-Baylis-Hillman Derivatives Using a Phase-Transfer Catalyst.

Ryukichi Takagi, Emi Fujii, Hirotoshi Kondo, 2018, The Journal of organic chemistry.

Stereoselective Total Synthesis of (+)-Scyphostatin via a π-Facially Selective Diels−Alder Reaction

Ryukichi Takagi, K. Tojo, K. Ohkata, 2007 .

Stereoselective syntheses of (+)-rhopaloic acid A and (–)-ent- and (±)-rac-rhopaloic acid A

S. Kojima, Ryukichi Takagi, K. Ohkata, 1998 .

Synthesis of norsesterterpene rac- and ent-rhopaloic acid A

S. Kojima, Ryukichi Takagi, K. Ohkata, 1997 .

Stereoselective cyclopropanation of 3-aryl-2-phosphonoacrylates induced by the (−)-8-phenylmenthyl group as a chiral auxiliary

S. Kojima, Ryukichi Takagi, K. Ohkata, 2001 .

Computational study on the cyclopropanation reaction of ylides generated from α-pyridiniumacetates

S. Kojima, Ryukichi Takagi, K. Ohkata, 2010 .

Asymmetric induction in Darzens condensation by means of (–)-8-phenylmenthyl and (–)-menthyl auxiliaries

S. Kojima, Ryukichi Takagi, K. Ohkata, 1998 .

SELECTIVE CONVERSION OF BROMO OXIRANE INTO TETRAHYDROPYRANYLACRYLATE BY EPOXIDE RING OPENING

Ryukichi Takagi, K. Ohkata, Y. Hiraga, 1997 .

ChemInform Abstract: Stereoselective Formation of trans-2,5-Disubstituted Tetrahydropyrans by Intramolecular Nucleophilic Substitution and a Computational Study at the AM1 Level.

S. Kojima, Ryukichi Takagi, K. Ohkata, 2001 .

Construction of the bicyclo[3.3.1]nonenone core by successive Michael reactions of 2-cyclohexenone derivatives

Ryukichi Takagi, K. Ohkata, Y. Miwa, 2004 .

Concentration and temperature dependency of regio- and stereoselectivity in a photochemical [2 + 2] cycloaddition reaction (the Paternò-Büchi reaction): origin of the hydroxy-group directivity.

Ryukichi Takagi, Y. Hiraga, M. Abe, 2011, Journal of the American Chemical Society.

Efficient synthesis of a 4,5-epoxy-2-cyclohexen-1-one derivative bearing a spirolactone via a Diels-Alder reaction with high pi-facial selectivity: a synthetic study towards scyphostatin.

Ryukichi Takagi, K. Ohkata, Y. Tamura, 2002, Chemical communications.

Asymmetric darzens condensation of ketones with α-chloroacetates by means of (–)-8-phenylmenthyl auxiliary

Ryukichi Takagi, K. Ohkata, Y. Hiraga, 1996 .

Design and Synthesis of a 4-Nitrobromobenzene Derivative Bearing an Ethylene Glycol Tetraacetic Acid Unit for a New Generation of Caged Calcium Compounds with Two-Photon Absorption Properties in the Near-IR Region and Their Application in Vivo

H. Kasai, C. Katan, K. Furukawa, 2016, ACS omega.

EXCELLENT Z-SELECTIVE OLEFIN FORMATION USING PENTACOORDINATE SPIROPHOSPHORANES AND ALDEHYDES. WITTIG TYPE REACTION VIA HEXACOORDINATE INTERMEDIATES

S. Kojima, K. Akiba, Ryukichi Takagi, 1997 .

Two ring opened oxetane taxoids containing a C-20 benzoyloxy group from the roots of Taxus wallichiana Zucc.

N. Nguyen, P. Dang, M. T. T. Nguyen, 2017 .

Organocatalytic asymmetric desymmetrization of 4,4-disubstituted cyclohexadienones via an intermolecular Diels-Alder reaction.

Ryukichi Takagi, Takehiko Nishi, 2015, Organic & biomolecular chemistry.

2-(4-Nitrophenyl)-1H-indolyl-3-methyl chromophore: A versatile photocage that responds to visible-light one-photon and near-infrared-light two-photon excitations

Ryukichi Takagi, M. Abe, Kozue Hamao, 2021, Chemistry Letters.

Stereochemical deuterium‐labeling study on the denitrogenation of 7,7‐diethoxy‐2,3‐diazabicyclo[2.2.1]hept‐2‐ene

Ryukichi Takagi, Y. Hiraga, M. Abe, 2011 .

Influence of Polymerization Degree of Poly-L-leucine Catalyst and Substituent Effect on the Julia-Colonna Asymmetric Epoxidation of Benzalacetophenones

S. Begum, Ryukichi Takagi, K. Ohkata, 2004 .

Stereoselectivity control by oxaspiro rings during Diels-Alder cycloadditions to cross-conjugated cyclohexadienones: the syn oxygen phenomenon.

S. Kojima, L. Paquette, Ryukichi Takagi, 2004, Journal of the American Chemical Society.

Enantioselective intramolecular [2 + 2] photocycloaddition using phosphoric acid as a chiral template.

Ryukichi Takagi, C. Tabuchi, 2020, Organic & biomolecular chemistry.

Construction of the adamantane core of plukenetione-type polycyclic polyprenylated acylphloroglucinols.

Ryukichi Takagi, K. Ohkata, Y. Inoue, 2008, The Journal of organic chemistry.

Construction of the Bicyclo[3.3.1]nonenone Core by Successive Michael Reactions of 2-Cyclohexenone Derivatives.

Ryukichi Takagi, K. Ohkata, Y. Miwa, 2005 .

Enantioselective [2 + 2] photocycloaddition of quinolone using a C1-symmetric chiral phosphoric acid as a visible-light photocatalyst.

Ryukichi Takagi, Takaaki Tanimoto, 2022, Organic & biomolecular chemistry.

Stereoselective total synthesis of (+)-Scyphostatin via a pi-facially selective Diels-Alder reaction.

Ryukichi Takagi, K. Tojo, K. Ohkata, 2007, The Journal of organic chemistry.

One-pot synthesis of adamantane derivatives by domino Michael reactions from ethyl 2,4-dioxocyclohexanecarboxylate.

Ryukichi Takagi, K. Ohkata, Y. Miwa, 2005, The Journal of organic chemistry.