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Atsushi Toyao

Kanazawa University

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Publication

Featured researches published by Atsushi Toyao.

Tetrahedron Letters | 2001

A concise construction of an erythrinane skeleton using Mn(III)/Cu(II)-mediated oxidative radical cyclization of α-methylthio amides

Atsushi Toyao; Shiho Chikaoka; Yoshifumi Takeda; Osamu Tamura; Osamu Muraoka; Genzoh Tanabe; Hiroyuki Ishibashi

Oxidative radical cyclizations of enamide 3 with Mn(OAc)3 in the presence of Cu(II) were examined. When Cu(OAc)2 was used as an additive, 4-acetoxyerythrinane derivative 5 was formed, whereas the use of Cu(OTf)2 afforded simple erythrinane 6.

Chemical Communications | 2003

Highly stereoselective synthesis of (?)-monatin, a high-intensity sweetener, using chelation-controlled nitrone cycloadditionElectronic supplementary information (ESI) available: characterisation data. See http://www.rsc.org/suppdata/cc/b3/b306791m/

Osamu Tamura; Tomoya Shiro; Atsushi Toyao; Hiroyuki Ishibashi

Synthesis of (-)-monatin was achieved by chelation-controlled cycloaddition of nitrone 2 with allyl alcohol 3a in the presence of MgBr2-OEt2.

Journal of Organic Chemistry | 2002

Is an iodine atom almighty as a leaving group for Bu3SnH-Mediated radical cyclization? The effect of a halogen atom on the 5-endo-trig radical cyclization of N-vinyl-α-halo amides

Osamu Tamura; Hana Matsukida; Atsushi Toyao; Yoshifumi Takeda; Hiroyuki Ishibashi

Synlett | 2002

TBAT-Mediated Nitrone Formation of ω-Mesyloxy-O-tert-butyldiphenylsilyl-oximes: Facile Synthesis of Cyclic Nitrones from Hemiacetals

Osamu Tamura; Atsushi Toyao; Hiroyuki Ishibashi

Journal of Organic Chemistry | 2003

Mn(III)/Cu(II)-mediated oxidative radical cyclization of α-(methylthio)acetamides leading to erythrinanes

Shiho Chikaoka; Atsushi Toyao; Mizuho Ogasawara; Osamu Tamura; Hiroyuki Ishibashi

Chemical Communications | 2003

Highly stereoselective synthesis of (−)-monatin, a high-intensity sweetener, using chelation-controlled nitrone cycloaddition

Osamu Tamura; Tomoya Shiro; Atsushi Toyao; Hiroyuki Ishibashi

Synlett | 1999

Mn(III)/Cu(II)-Mediated Radical Cyclization of α-(Methylthio)acetamides

Hiroyuki Ishibashi; Atsushi Toyao; Yoshifumi Takeda

Synlett | 2002

A Concise Synthesis of (-)-Codonopsinine and an Approach to Synthesis of (+)-Hyacinthacines A1 and A2 from a Polyhydroxylated Cyclic Nitrone

Atsushi Toyao; Osamu Tamura; Hiroko Takagi; Hiroyuki Ishibashi

International Symposium on the Chemistry of Natural Products | 2006

P-103 SYNTHESES OF HYACINTHACINES A_1, A_2, AND CASUARINE USING ADDITION REACTION OF NITRONES

Osamu Tamura; Hiroshi Takeuchi; Atsushi Toyao; Hiroyuki Ishibashi

19th International Congress on Heterocyclic Chemistry#R##N#Book of Abstracts | 2003

Novel Nitrone-Formation Reaction and it's Application to Pyrrolidine and Pyrrolizidine Alkaloids

Osamu Tamura; Atsushi Toyao; Hiroko Takagi; Hiroyuki Ishibashi

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Hiroyuki Ishibashi

Kanazawa University

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Osamu Tamura

Showa Pharmaceutical University

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Yoshifumi Takeda

Osaka University

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Hiroko Takagi

Kanazawa University

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Shiho Chikaoka

Kanazawa University

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Tomoya Shiro

Kanazawa University

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Genzoh Tanabe

Kindai University

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Mizuho Ogasawara

Kanazawa University

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Osamu Muraoka

Kindai University

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