Search Results - "Momose, Takefumi"

Concise Syntheses of Natural .gamma.-Butyrolactones, (+)-trans-Whisky Lactone, (+)-trans-Cognac Lactone, (-)-Methylenolactocin, (+)-Nephrosteranic Acid, and (+)-Roccellaric Acid Using Novel Chiral Butenolide Synthons by Takahata, Hiroki, Uchida, Yasuhiro, Momose, Takefumi

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2-Piperidone Type of Chiral Building Block for 3-Piperidinol Alkaloid Synthesis by Toyooka, Naoki, Yoshida, Yasuko, Yotsui, Yasuhito, Momose, Takefumi

“…An enantiomeric pair of a new 2-piperidone type of chiral building block (1) has been prepared by bakers' yeast reduction of β-keto ester (2) or…”
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A general asymmetric route to trans- or cis-2,6-disubstituted piperidine. First total synthesis of (+)-9-epi-6-epipinidinol and (−)-pinidinol by Takahata, Hiroki, Yotsui, Yasuhito, Momose, Takefumi

“…Starting from 1,6-heptadiene, two AD reactions in a stepwise manner lead to the anti-1,5-diol and syn-1,5-diol stereodivergently, which have been converted by…”
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Highly stereoselective construction of trans(2,3)- cis(2,6)-trisubstituted piperidines: An application to the chiral synthesis of Dendrobates alkaloids by Toyooka, Naoki, Tanaka, Keiko, Momose, Takefumi, Daly, John W, Garraffo, H.Martin

“…A general and flexible route to the 5,8-disubstituted indolizidine and 1,4-disubstituted quinolizidine system found in Dendrobates alkaloids has been…”
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Asymmetric Synthesis of the Indolizidine Alkaloids 207A, 209B, and 235B': 6-Substituted 2,3-Didehydropiperidine-2-carboxylate as a Versatile Chiral Building Block by Momose, Takefumi, Toyooka, Naoki

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Highly stereoselective construction of 4,6- cis-substituted quinolizidine ring core: an application to enantioselective total synthesis of the marine alkaloid clavepictines A, B and pictamine by Toyooka, Naoki, Yotsui, Yasuhito, Yoshida, Yasuko, Momose, Takefumi, Nemoto, Hideo

“…The enantioselective total synthesis of the marine alkaloids clavepictines A, B and pictamine has been achieved through the highly stereocontrolled…”
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Enantio- and diastereodivergent synthesis of all four diastereomers of the 2,6-disubstituted 3-piperidinol chiral building block by Toyooka, Naoki, Yoshida, Yasuko, Momose, Takefumi

“…Enantio- and diastereodivergent synthesis of all four diastereomers of 2,6-disubstituted 3-piperidinol has been achieved. The versatility of these compounds as…”
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Asymmetric intramolecular amidation of N-(tert-butoxycarbonyl)-3-hydroxy-4-pentenylamine. A new entry to chiral building blocks for the synthesis of biologically active nitrogen-containing compounds by Takahata, Hiroki, Banba, Yasunori, Tajima, Mayumi, Momose, Takefumi

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Aerobic deprotection of monothioacetals catalyzed by trichlorooxyvanadium by Kirihara, Masayuki, Ochiai, Yuta, Arai, Nobuka, Takizawa, Shinobu, Momose, Takefumi, Nemoto, Hideo

“…Monothioacetals are easily deprotected into carbonyls using a catalytic amount of trichlorooxyvanadium under an oxygen atmosphere. Monothioacetals are easily…”
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Fluorinative beckmann fragmentation : Fluorinative α-cleavage of cyclic ketoximes by diethylaminosulfur trifluoride by KIRIHARA, M, NIIMI, K, OKUMURA, M, MOMOSE, T

“…Diethylaminosulfur trifluoride reacted with cyclic ketoximes bearing substituent(s) that can stabilize a carbocation to cause fluorinative fragmentation,…”
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α-Bromo-α, α-difluoroallyl derivatives as synthetic intermediate: Nucleophilic substitution of α-bromo-α, α-difluoroallyl derivatives in the presence of palladium catalysts by KIRIHARA, M, TAKUWA, T, OKUMURA, M, WAKIKAWA, T, TAKAHATA, H, MOMOSE, T, TAKEUCHI, Y, NEMOTO, H

“…The palladium catalyzed nucleophilic substitution of alpha-bromo-alpha,alpha-difluoroallyl derivatives turned out to be an efficient method for the preparation…”
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An Asymmetric Synthesis of the Ant Venom Alkaloid(3S,5S,8aR)-3-Butyl-5-(4-pentenyl)indolizidine via the Sharpless Asymmetric Dihydroxylation by Takahata, Hiroki, Bandoh, Hiroshi, Momose, Takefumi

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New Synthesis of All Four Isomers of 3-Hydroxy-4-methyl-.gamma.-butyrolactone by Stereoselective Intramolecular Lactonization. Application to Asymmetric Synthesis of Biologically Active Compounds by Takahata, Hiroki, Uchida, Yasuhiro, Momose, Takefumi

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A short and practical synthesis of (+)-pseudoconhydrine and (+)-N-methylpseudoconhydrine via osmium catalyzed asymmetric dihydroxylation by TAKAHATA, H, INOSE, K, MOMOSE, T

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Asymmetric Synthesis of Methyl N,O-Diacetylspicigerinate by Momose, Takefumi, Toyooka, Naoki

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TOTAL SYNTHESIS OF (+)-MONOMORINE I VIA ASYMMETRIC α-KETONIC CLEAVAGE OF 8-AZABICYCLO[3.2.1]OCTAN-3-ONE by MOMOSE, Takefumi, TOYOOKA, Naoki, SEKI, Sumie, HIRAI, Yoshiro

“…The total synthesis of (+)-monomorine I and preparation of cis-2, 5-difunctionalized pyrrolidines, as a chiral synthon, starting with asymmetric cleavage of…”
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ELECTROPHILIC OLEFIN HETEROCYCLIZATION IN ORGANIC SYNTHESIS. : STEREOSELECTIVE INTRAMOLECULAR AMIDOMERCURATION OF γ-HYDROXY-δ, ε-UNSATURATED URETHANES by TAKAHATA, Hiroki, TAJIMA, Mayumi, BANBA, Yasunori, MOMOSE, Takefumi

“…Mercuric acetate driven cyclization of γ-hydroxy-δ, ε-unsaturated urethanes 1a, b proceeded regio- and stereoselectively to afford…”
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2(3H)- and 2(5H)-Furanones. IV. The Di-π-methane Rearrangement of 3, 4-Bis(phenymethyl)-2(5H)-furanone by MOMOSE, Takefumi, TANABE, Genzoh, TSUJIMORI, Hisayuki, MURAOKA, Osamu

“…The photo-irradiation of 3, 4-bis(phenylmethyl)-2(5H)-furanone (5) in acetone or in methanol resulted in selective rearrangement of the 4-phenymethyl moiety…”
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Indium-Mediated Reaction of 3-Bromo-3,3-difluoropropene and Bromodifluoromethylacetylene Derivatives with Aldehydes by Kirihara, Masayuki, Takuwa, Tomofumi, Takizawa, Shinobu, Momose, Takefumi, Nemoto, Hideo

“…Aldehydes reacted with 3-bromo-3,3-difluoropropene at the α-position in the presence of indium to afford 1-substituted-2,2-difluorobut-3-en-1-ols. Ketones and…”
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Bicyclo[3.3.1]nonanes as Synthetic Intermediates. XV. : Ring Enlargement of Bicyclo[3.3.1]nonane-2, 6-dione and Bicyclo[3.3.1]nonan-2-one; Revision of the Literature by MOMOSE, Takefumi, MURAOKA, Osamu, MASUDA, Kikuo

“…The diazomethane-conducted ring expansion of bicyclo[3.3.1]nonane-2, 6-dione (1) was re-examined, and the main product, identified previously as…”
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