Search Results - "Ogasawara, Kunio"

A Diastereocontrolled Synthesis of (+)-Febrifugine:  A Potent Antimalarial Piperidine Alkaloid by Taniguchi, Takahiko, Ogasawara, Kunio

“…A diastereocontrolled synthesis of (+)-febrifugine, a potent antimalarial piperidine alkaloid, has been achieved using a chiral block having a…”
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7,7-Dimethyl-6,8-dioxabicyclo[3.3.0]oct-3-en-2-one as a synthetic equivalent of ketodicyclopentadiene: a new route to (−)-physostigmine, (−)-physovenine, and (−)-aphanorphine by Tanaka, Keigo, Taniguchi, Takahiko, Ogasawara, Kunio

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Extremely Facile and Selective Nickel-Catalyzed Allyl Ether Cleavage by Taniguchi, Takahiko, Ogasawara, Kunio

“…Child's play! Allyl ethers as protecting groups for hydroxyl functions can be removed readily with a combination of DIBAL and catalytic amounts of…”
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Chemoenzymatic preparation of functionalized bicyclo[3.2.1]octenone and practical utilization by Ito, Shinichiro, Tosaka, Ayako, Hanada, Keisuke, Shibuya, Masatoshi, Ogasawara, Kunio, Iwabuchi, Yoshiharu

“…A practical route for the synthesis of both enantiomers of a functionalized bicyclo[3.2.1]octenone, which is potentially useful as a versatile chiral building…”
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An Enantio- and Diastereocontrolled Synthesis of (+)-7-Deoxy-trans-dihydronarciclasine by Iwabuchi, Yoshiharu, Ogasawara, Kunio, Fujimura, Takashi, Shibuya, Masatoshi

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Optimization of ring-contraction of the meso enedione epoxide for chiral building block synthesis by Tanaka, Hideyuki, Kozuki, Yoshihiro, Ogasawara, Kunio

“…The ring-contraction of the enedione epoxide obtained from the adduct of benzoquinone and cyclopentadiene is mainly affected by the amount of base used…”
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The Stereocontrolled Total Synthesis of (−)-O-Methylpallidinine by Hanada, Keisuke, Miyazawa, Norio, Ogasawara, Kunio

“…The stereocontrolled total synthesis of (−)-O-methylpallidinine, a naturally occurring Morphinan alkaloid with a B/C-trans-hydrophenanthrene framework, has…”
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Tandem Single-Step Construction of Chiral Hexahydrophenanthrenes:  A Concise Route to (+)-Ferruginol by Nagata, Hiroshi, Miyazawa, Norio, Ogasawara, Kunio

“…An efficient enantio- and diastereocontrolled construction of hydrophenanthrenes having either a quaternary or a tertiary benzylic stereogenic center has been…”
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Intramolecular ene reaction on a bicyclo[3.2.1]octane system: an alternative route to (−)-kainic acid by Hirasawa, Hideaki, Taniguchi, Takahiko, Ogasawara, Kunio

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Total Synthesis of (-)-Dihydrocorynantheol Using Bicyclo[3.2.1]octenone Chiral Building Block by Iwabuchi, Yoshiharu, Ogasawara, Kunio, Tosaka, Ayako, Ito, Shinichiro, Miyazawa, Norio, Shibuya, Masatoshi

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A New Route to (+)-Estrone Using a Bicyclo[3.2.1]octane Chiral Building Block by Hanada, Keisuke, Miyazawa, Norio, Ogasawara, Kunio

“…A new route to (+)-estrone has been developed starting from the chiral building block having a bicyclo[3.2.1]octane framework based on the inherent…”
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Enantio- and Diastereocontrolled Synthesis of an Angular Triquinane Sesquiterpene (+)-Arnicenone by Iura, Yosuke, Sugahara, Tsutomu, Ogasawara, Kunio

“…(+)-Arnicenone, a sesquiterpene of an angular triquinane isolated from Arnica plants, has been synthesized for the first time in an enantiocontrolled manner…”
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Diastereoselective Synthesis of 3,4-Dimethoxy-7-morphinanone: A Potential Route to Morphine by Yamada, Osamu, Ogasawara, Kunio

“…Diastereoselective synthesis of racemic 3,4-dimethoxy-7-morphinanone from racemic 2-(2,3-dimethoxyphenyl)cyclohexen-1-ol has been achieved. The relative…”
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A concise enantiocontrolled route to yohimbones using a bicyclo[3.2.1]octane chiral building block by Miyazawa, Norio, Ogasawara, Kunio

“…A facile enantio- and diastereocontrolled construction of 18-keto-pseudoyohimbane from a bicyclo[3.2.1]octane chiral building block has been developed…”
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Facile and specific nickel-catalyzed de- N-allylation by Taniguchi, Takahiko, Ogasawara, Kunio

“…A general procedure for a chemoselective removal of the allyl (2-propenyl) functionality on basic, neutral and acidic nitrogens by diisobutylaluminum hydride…”
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Oxidative resolution of 2-cyclopentenols by the asymmetric hydrogen transfer protocol by Iura, Yosuke, Sugahara, Tsutomu, Ogasawara, Kunio

“…A Ru II-chiral amine complex has accomplished oxidative resolution of the 2-cyclopentene-1-ols having a bicyclo[2.2.1]heptene background to afford the…”
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A Stereocontrolled Synthesis of (+)- Rhopaloic Acid A Using a Dioxabicyclo- [3.2.1]octane Chiral Building Block by Ogasawara, Kunio, Kadota, Kohei

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Enantioconvergent synthesis of (+)-estrone from racemic 4- tert-butoxy-2-cyclopentenone by Sugahara, Tsutomu, Ogasawara, Kunio

“…(+)-Estrone has been synthesized in an enantioconvergent manner from racemic 4- tert-butoxy-2-cyclopentenone via contrasteric Diels-Alder reaction and…”
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Enantio- and diastereocontrolled synthesis of (−)-19( S)-acetoxy- N1-acetyl-20-epitubifolidine by Shin, Kogyoku, Moriya, Minoru, Ogasawara, Kunio

“…An enantiocontrolled route to the 19-oxygenated pentacyclic Strychnos alkaloids has been demonstrated by the stereoselective synthesis of (−)-19( S)-acetoxy- N…”
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Stereo- and enantio-controlled synthesis of two naturally occurring polyoxygenated cyclohexenemethanols, (+)-epiepoxydon and (−)-phyllostine, via catalytic asymmetrization of a meso substrate by Kamikubo, Takashi, Hiroya, Kou, Ogasawara, Kunio

“…Two naturally occurring polyoxygenated cyclohexenemethanols, (+)-epiepoxydon and (−)-phyllostine, have been first synthesized in stereo- and enantio-controlled…”
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