Search Results - "川端, 猛夫"

光学活性オリゴナフタレン類の合成と光学挙動 by 高石, 和人, 椿, 一典, 田中, 弘之, 三浦, 正哉, 川端, 猛夫

“…1. 緒言 らせん構造は三次元的に高度に秩序だった構造であり, 限られた空間に密に構造, 情報を詰め込むのに最も適したモチーフと考えられる. 自然界においてはDNAの二重らせんやタンパク質のα-ヘリックスなど数多くのらせん構造が知られている. また, これらを手本として多くの人工らせん型分子も合成されている. 1,…”
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エノレート化学を基盤とする新しい不斉合成法の開発 : β-ラクタム合成と不斉記憶 by 川端, 猛夫

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Final-Stage Site-Selective Acylation for the Total Syntheses of Multifidosides A-C by Ueda, Yoshihiro, Furuta, Takumi, Kawabata, Takeo

“…The first total syntheses of multifidosides A–C have been achieved. The synthetic strategy is characterized by catalytic site‐selective acylation of…”
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Total Synthesis of Ellagitannins through Regioselective Sequential Functionalization of Unprotected Glucose by Takeuchi, Hironori, Mishiro, Kenji, Ueda, Yoshihiro, Fujimori, Yusuke, Furuta, Takumi, Kawabata, Takeo

“…Short total syntheses of natural glycosides (ellagitannins) were performed through sequential and regioselective functionalization of the hydroxy groups of…”
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Enantioselective preparation of mechanically planar chiral rotaxanes by kinetic resolution strategy by Imayoshi, Ayumi, Lakshmi, Bhatraju Vasantha, Ueda, Yoshihiro, Yoshimura, Tomoyuki, Matayoshi, Aki, Furuta, Takumi, Kawabata, Takeo

“…Asymmetric synthesis of mechanically planar chiral rotaxanes and topologically chiral catenanes has been a long-standing challenge in organic synthesis…”
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Perfectly regioselective acylation of a cardiac glycoside, digitoxin, via catalytic amplification of the intrinsic reactivity by Yoshida, Keisuke, Furuta, Takumi, Kawabata, Takeo

“…Organocatalytic regioselective acylation of digitoxin has been developed. This method provides the 4′′′- O-manoacylate as the sole product without the…”
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Catalyst-controlled reversal of chemoselectivity in acylation of 2-aminopentane-1,5-diol derivatives by Yoshida, Keisuke, Shigeta, Takashi, Furuta, Takumi, Kawabata, Takeo

“…Highly chemo- and regioselective acylation of 2-aminopentane-1,5-diol derivatives has been achieved by organocatalysis. An acyl group can be chemoselectively…”
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Catalytic discrimination between formyl groups in regio- and stereoselective intramolecular cross-aldol reactions by Baba, Tomonori, Yamamoto, Junya, Hayashi, Kazuhiro, Sato, Makoto, Yamanaka, Masahiro, Kawabata, Takeo, Furuta, Takumi

“…Catalytic discrimination between inequivalent formyl groups was achieved using an aniline-type acid-base catalyst for the regio-, diastereo-, and…”
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Oxidative kinetic resolution of racemic alkyl aryl carbinols by an electronically tuned chiral nitroxyl radical by Hamada, Shohei, Wada, Yoshiyuki, Sasamori, Takahiro, Tokitoh, Norihiro, Furura, Takumi, Kawabata, Takeo

“…A method for oxidative kinetic resolution of racemic alcohols catalyzed by chiral nitroxyl radical (R,R)-1 has been developed. This method is especially…”
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Asymmetric desymmetrization of meso-diols by C(2)-symmetric chiral 4-pyrrolidinopyridines by Schedel, Hartmut, Kan, Keizo, Ueda, Yoshihiro, Mishiro, Kenji, Yoshida, Keisuke, Furuta, Takumi, Kawabata, Takeo

“…In this work we developed C(2)-symmetric chiral nucleophilic catalysts which possess a pyrrolidinopyridine framework as a catalytic site. Some of these…”
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Asymmetric desymmetrization of meso-diols by C2-symmetric chiral 4-pyrrolidinopyridines by Schedel, Hartmut, Kan, Keizo, Ueda, Yoshihiro, Mishiro, Kenji, Yoshida, Keisuke, Furuta, Takumi, Kawabata, Takeo

“…In this work we developed C 2 -symmetric chiral nucleophilic catalysts which possess a pyrrolidinopyridine framework as a catalytic site. Some of these…”
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ENHANCED REACTIVITY OF ZINC ENOLATES OVER LITHIUM ENOLATES IN ASYMMETRIC NITROOLEFINATION by FUJI, Kaoru, KAWABATA, Takeo, NANIWA, Yoshimitsu, OHMORI, Toshiumi, NODE, Manabu

“…Zinc enolates derived from an ester and a lactone, 1 and 4, were found to have enhanced reactivity over the corresponding lithium enolates in asymmetric…”
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Hard Acid and Soft Nucleophile System. IV. Removal of Benzyl Protecting Group with Boron Trifluoride Etherate and Dimethyl Sulflide by FUJI, KAORU, KAWABATA, TAKEO, FUJITA, EIICHI

“…A new combination system consisting of boron trifluoride etherate and dimethyl sulfide has proved to be useful especially for the selective removal of the…”
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DIFFERENTIATION INDUCTION OF HUMAN PROMYELOCYTIC LEUKEMIA CELLS WITH COLLETOCHLORIN B AND ITS ANALOGUES by Takahashi, Noriko, Osada, Hiroshi, Numao, Naganori, Saimoto, Hiroyuki, Kawabata, Takeo, Hiyama, Tamejiro

“…Colletochlorin analogues are found to be highly potent inducers of differentiation of human promyelocytic leukemia cells. The differentiated cells are…”
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Hard Acid and Soft Nucleophile System. VII. A Convenient Reduction of Functionalized Polyarenes to Parent Polyarenes by NODE, MANABU, NISHIDE, KIYOHARU, KAWABATA, TAKEO, OHTA, KEIICHIRO, WATANABE, KHOJI, FUJI, KAORU, FUJITA, EIICHI

“…Oxygen functions and halogens at the peri-carbon atom in polyarenes were reductively removed with the AlCl3-EtSH reagent system to afford the parent polyarenes…”
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