K. Ohkata

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.

Studies on Ring-Closing Metathesis for the Formation of the 11-Membered Ring System of Daphnezomine C

S. Kojima, K. Ohkata, K. Tanabe, 2007 .

CYCLOADDITIONS AND REACTIONS OF OXA-AROMATICS WITH NUCLEOPHILES

K. Akiba, K. Ohkata, 1996 .

Selective Ring-expansion of Oxirane into Tetrahydropyran and Tetrahydrofuran by Reagent-controlled Conditions

K. Ohkata, Y. Hiraga, Munetaka Tokumasu, 1998 .

Two-parameter Analysis of Solvent Effects on Selectivity in Chemical Reactions: Information of Polarity and Activation Volume at the Transition State in Organic and Enzymatic Reactions

K. Ohkata, Y. Hiraga, Chunlei Lin, 2006 .

Highly Stereoselective 7-Membered Ring Synthesis Based upon the Oxidopyrylium–Alkene [5+2]Cycloaddition Reaction

S. Kojima, K. Ohkata, N. Ohmori, 2001 .

Temperature-dependence of enantioselectivity and desymmetrization in the acetylation of 2-mono- and 2,2-di-substituted 1,3-propanediols by a novel lipase isolated from the yeast Cryptococcus spp. S-2

K. Masaki, H. Iefuji, K. Ohkata, 2006 .

Synthesis and chemical behaviors of 12-substituted dibenz[c,f][1,5]azastibocine and dibenz[c,f][1,5]azabismocine derivatives: evidences of 10-Pn-4 type hypervalent interaction

K. Akiba, S. Takemoto, K. Ohkata, 1989 .

Loliolide and Other Germination Inhibitory Active Constituents in Equisetum Arvense

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

Comparison of the chiral recognition of prochiral substrates in the acetylation reaction by a novel lipase (CSL) from the yeast, Cryptococcus spp. S-2 with immobilized PPL: Enzyme-catalyzed desymmetrization and asymmetrization of prochiral 2-substituted 1,3-propanediols by CSL and immobilized PPL

K. Masaki, H. Iefuji, K. Ohkata, 2006 .

Debromination of phenacyl and benzylic bromides with tertiary stibine and the mechanistic consideration

K. Akiba, K. Ohkata, A. Shimizu, 1985 .

Diels-Alder reactions of 2-[(trialkylsilyl)oxy]pyrylium cations of 2H-pyran-2-one and 2H-1-benzopyran-2-one derivatives

K. Akiba, K. Ohkata, Y. Utsumi, 1991 .

Reactions of 4-siloxy-1-benzopyrylium salts with allylsilane and allylstannane reagents.

K. Akiba, K. Ohkata, K. Ishimaru, 1990 .

Cycloadditions and Reactions of Oxa-Aromatics with Nucleophiles

K. Akiba, K. Ohkata, 1996 .

Tandem reactions in 4-siloxy-1-benzopyrylium salts : introduction of substituents and cyclohexene and cyclopentane annulation in chromones

K. Akiba, K. Ohkata, H. Iwasaki, 1991 .

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.

Stereoselective formation of activated cyclopropanes with pyridinium ylides bearing a (−)-8-phenylmenthyl group as the chiral auxiliary

S. Kojima, M. Shimizu, K. Ohkata, 2000 .

Stereoselective synthesis of activated cyclopropanes with an α-pyridinium acetamide bearing an 8-phenylmenthyl group as the chiral auxiliary

S. Kojima, K. Ohkata, Kyoko Hiroike, 2004 .

Asymmetric synthesis of activated cyclopropanes catalyzed by cinchonidine as a chiral Brønsted base

S. Kojima, A. Watanabe, K. Ohkata, 2006 .

SYNTHESES OF 1,1,2,2-TETRAACYLCYCLOPROPANE DERIVATIVES BY PHOTOCHEMICAL REARRANGEMENT OF 2,2,4-TRIACYL-2,3-DIHYDROFURANS

T. Sakai, K. Ohkata, T. Hanafusa, 1978 .

Hydrophobicity and structure of 1,2,4-triazole derivatives bearing 1-carbamoyl and 3-sulfonyl groups

S. Kojima, K. Ohkata, Y. Hiraga, 2002 .

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 .

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 .

ASYMMETRIC INDUCTION IN INTRAMOLECULAR 5 + 2 CYCLOADDITION OF 2-(4-ALKENYL)-5-BENZOYLOXY(OR 5-SILYLOXY)-4-PYRONES INVOLVING MIGRATION OF THE PYRONE O- 5 GROUP TO O-4

M. Yoshimura, K. Ohkata, N. Ohmori, 1997 .

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 .

Highly asymmetric induction in the Diels-Alder reaction of 3-alkoxycarbonyl-substituted coumarin

K. Akiba, K. Ohkata, K. Miyamoto, 1993 .

Diels-Alder Reactions of 2-((Trialkylsilyl)oxy)pyrylium Cations of 2H- Pyran-2-one and 2H-1-Benzopyran-2-one Derivatives.

K. Akiba, K. Ohkata, Y. Utsumi, 1992 .

OXIDATION OF α-HYDROXYKETONES WITH TRIPHENYLANTIMONY DIBROMIDE AND ITS CATALYTIC CYCLE

K. Akiba, K. Ohkata, Hideyuki Ohnari, 1985 .

Relationship between the Hydrophobicity of Dipeptides and the Michaelis–Menten Constant Km of Their Hydrolysis by Carboxypeptidase-Y and Carboxypeptidase-A

S. Kojima, K. Ohkata, Y. Hiraga, 2004 .

Ring-transformation equilibrium with participation of π-bonded S in an isothiazole system. Synthesis of non-ring-transformed 5-(2-aminovinyl)isothiazole derivative via 1,3-silyl group shift

K. Akiba, K. Ohkata, Y. Ohyama, 1984 .

First example of an isolable .sigma.-sulfurane with an apical alkyl group effected by transannular bond formation between the amino and the sulfonio groups

K. Akiba, K. Ohkata, F. Iwasaki, 1983 .

Transannular bond formation between the amino and the sulfonio groups in 6,7-dihydro-6-methyl-5H-dibenzo[b,g][1,5]thiazocinium salts. The first example of a sulfurane with an apical alkyl group

K. Akiba, K. Ohkata, Y. Shimizu, 1986 .

Transannular bond formation between the antimony and the nitrogen atoms in dibenz[c,f][1,5]azastibocine system. Formation of XSbX and XSbN+ hypervalent bond

K. Akiba, K. Ohkata, M. Ohnishi, 1988 .

The Difference in Solvolytic Reactivity between Diastereomers in α-(trans-2-Arylcyclopropyl)arylmethyl 3,5-Dinitrobenzoates

K. Ohkata, T. Hanafusa, T. Takata, 1979 .

Solvolysis of 2,3-Cyclopenteno-4H-homochromen-4-ol Acetate: Comparison with the Corresponding Carbocyclic System

H. Yamaoka, K. Ohkata, T. Hanafusa, 1976 .

Substituent Effects for the Benzene Ring on Solvolysis of 3,4-Benzotricyclo[4.3.1.01,6]dec-3-en-2-yl p-Nitrobenzoate

K. Ohkata, 1976 .

Synthesis of a new dibenzobicyclic stiborane by way of 10-Sb-4 hypervalent intermediate. 1,1-diaryl-5-aza-2,8-dioxa-1-stibaV-dibenzo[c,f]bicyclo[3,3]octadiene

K. Akiba, K. Ohkata, T. Yano, 1990 .

Transannular Bond Formation Between the Amino and the Sulfonio Groups in 6,7-Dihydro-6-methyl-5H-dibenzo(b,g) (1,5)thiazocinium Salts. The First Example of a Sulfurane with an Apical Alkyl Group.

K. Akiba, K. Ohkata, Y. Shimizu, 1987 .

Three new glycolipids with cytolytic activity from cultured marine dinoflagellate Heterocapsa circularisquama

K. Ohkata, Y. Hiraga, Triana Widianti, 2008, Natural product research.

Geometric dependence to long-range interaction of fused cyclopropane rings in tris-.sigma.-homotropylium cations

L. Paquette, K. Ohkata, 1980 .

RING-TRANSFORMATION FROM ISOTHIAZOLE TO 1,2,4-THIADIAZOLE - POSSIBLE INTERMEDIACY OF π-SULFURANE

K. Akiba, K. Ohkata, Akiko Noda, 1983 .

Synthesis of Hippospongic Acid A Analogues Designed for Investigating the Structure-Activity Relationship of its Biological Activity

Mariko Ago, K. Ohkata, Y. Hiraga, 2000 .

Asymmetric Synthesis of Rhopaloic Acid A Analogues and Their Biological Properties

K. Ohkata, Munetaka Tokumasu, A. Sasaoka, 1999 .

INTERDEPENDENCE OF SOLVOLYSIS RATE AND ARYL-ARYL DIHEDRAL ANGLE IN A SERIES OF 4-BIPHENYLYLDIMETHYLCARBINYL P-NITROBENZOATES

R. Paquette, L. Paquette, K. Ohkata, 1979 .

Structural Features of Tetraazathiapentalenes Fused with Pyrimidine and/or Pyridine Rings. Experimental Evaluation of the Nature of Hypervalent N−S−N Bond by Restricted Internal Rotation of the Pyrimidine Ring

K. Akiba, K. Ohkata, M. Ohsugi, 1996 .

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 .

Stereoelectronic effects on cyclobutyl participation. The 10-tetracyclo[5.2.1.02,6.O3,9]decyl cation

L. Paquette, K. Ohkata, C. W. Doecke, 1980 .

Kinetic Evidence for the Hydrophobic Atmosphere of the Catalytic Cavity in Carboxypeptidase Y Based on a Linear Relationship between Michaelis–Menten Constant Km and Hydrophobicity of the Substrates

S. Kojima, K. Ohkata, Y. Hiraga, 2001 .

Influence of solvent viscosity on the rate of hydrolysis of dipeptides by carboxypeptidase Y

S. Kojima, K. Ohkata, Yoshifumi Kanosue, 2004 .

Ring transformation equilibrium (bond switch) in 5-(2-aminovinyl)isothiazole system via hypervalent sulfurane. Synthesis, structure determination, and kinetic study

Yohsuke Yamamoto, K. Akiba, K. Ohkata, 1985 .

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.

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 .

On the Study of Various Reductions of 2-Benzoylcyclopentene-1-carboxylic Acid

K. Ohkata, T. Hanafusa, 1970 .

Stereochemical studies on 3,4-benzobicyclo[4.1.0]hept-3-en-2-ol systems and solvolytic studies on its p-nitrobenzoates

K. Ohkata, Y. Ogawa, K. Hanaoka, 1978 .

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.

The relative merits of 6π9C bishomoaromatic and 10π13C longicyclic stabilization

L. Paquette, K. Ohkata, Klaus Jelich, 1982 .

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.