Výsledky vyhledávání - "Tomokazu Uneda"

An efficient method for the one-pot construction of the 1H-naphtho[2,3-c]pyran-5,10-dione system

Autor: Kazuhiro Kobayashi, Miyuki Tanmatsu, Hisatoshi Konishi, Masaharu Uchida, Keiichi Yoneda, Osamu Morikawa, Tomokazu Uneda

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :2977-2982

2-(1-Hydroxyalkyl)-1,4-naphthoquinones are found to react with pyrrolidino enamines in toluene to give 1H-naphtho[2,3-c]pyran-5,10-diones in good yields via a tandem conjugate addition–cyclization sequence, followed by an elimination of pyrrolidine

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8da1917ca924414ce3b1dc8ae6214489
https://doi.org/10.1039/b106933k

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One-pot preparation of 1H-naphtho[2,3-c]pyran-5,10-diones and its application to concise total synthesis of (±)-eleutherin and (±)-isoeleutherin

Autor: Kazuhiro Kobayashi, Miyuki Tanmatsu, Tomokazu Uneda, Masaharu Uchida, Hisatoshi Konishi, Osamu Morikawa

Publikováno v: Tetrahedron Letters. 39:7725-7728

1H-Naphtho[2,3-c]pyran-5,10-dione derivatives, including a natural product (pentalongin), were generally synthesized in one-pot using a tandem conjugate addition-cyclization sequence between 2-(1-hydroxyalkyl)-1,4-naphthoquinones and enamines (or imi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6cff5cec478b535e2d6ec38d048704b7
https://doi.org/10.1016/s0040-4039(98)01683-9

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One-Step Synthesis of Naphthofurandione, Benzofurandione, and Phenalenofuranone Derivatives by the CAN-Mediated Cycloaddition

Autor: Kazuhiro Kobayashi, Hiroto Tanaka, Osamu Morikawa, Kazuaki Tanaka, Masako Mori, Tomokazu Uneda, Hisatoshi Konishi

Publikováno v: Bulletin of the Chemical Society of Japan. 71:1691-1697

The 3+2-type cycloaddition reaction of 2-hydroxy-1,4-naphthoquinones with various alkenes or phenylacetylene was mediated by ammonium cerium(IV) nitrate (CAN) to give the corresponding naphtho[2,3-b]furan-4,9-dione and naphtho[1,2-b]furan-4,5-dione d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ab0f3604b93d921570cea1a600e29d31
https://doi.org/10.1246/bcsj.71.1691

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One-pot synthesis of naphtho[2,3-b]furan-4,9-diones by sequential coupling/ring closure reactions

Autor: Hisatoshi Konishi, Masataka Kawakita, Tomokazu Uneda, Osamu Morikawa, Kazuhiro Kobayashi

Publikováno v: Tetrahedron Letters. 38:837-840

Treatment of 3-phenyliodonio-1,2,4-trioxo-1,2,3,4-tetrahydronaphthalenides with terminal acetylenes in the presence of a bis(triphenylphosphine)palladium chloride-cuprous iodide catalyst or cuprous oxide in N -methylpiperidine or pyridine, respective

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7ff52a7a5ab8eeda04ddaf9272751dfa
https://doi.org/10.1016/s0040-4039(96)02462-8

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Efficient Synthesis of 1-Amino-2-naphthalenecarboxylic Acid Derivatives via a Sequential Michael Addition/Enolate−Nitrile Coupling Route and Its Application to Facile Preparation of 9-Amino Analogues of Arylnaphthofuranone Lignans

Autor: Keiichiro Takada, Taichi Kitamura, Hideo Tanaka, Kazuhiro Kobayashi, Tomokazu Uneda, Osamu Morikawa, Hisatoshi Konishi

Publikováno v: The Journal of Organic Chemistry. 62:664-668

The reaction of 2-(alpha-lithioalkyl)benzonitriles, generated in situ by treatment of 2-alkylbenzonitriles with LDA in diglyme, with alpha,beta-unsaturated carboxylates and nitriles produced 1-amino-3,4-dihydro-2-naphthalenecarboxylates and carbonitr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9aa4c3add3b558de36e5e8973d03b4d0
https://doi.org/10.1021/jo961744r

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A simple method for the synthesis of 4-aryl-9-oxynaphthofuranone lignans

Autor: Tomokazu Uneda, K. Maeda, Kazuhiro Kobayashi, Hisatoshi Konishi, Osamu Morikawa

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :443-446

The 9-aryl-4-oxynaphthofuran-1(3H)-one system is generally synthesized in two steps from α-aryl-o-toluic acid derivatives. The method involves a tandem conjugate addition–Dieckmann type condensation between α-lithiated α-aryl-o-toluic acid deriv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d876d3653be8819cf9752a8204ac72fa
https://doi.org/10.1039/a605288f

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ChemInform Abstract: An Efficient General Synthesis of 1-Amino-2-naphthalenecarboxylic Acid Derivatives Based on a Tandem Conjugate Addition-Enolate Nitrile Coupling Sequence

Autor: Hiroto Tanaka, Tomokazu Uneda, Keiichiro Takada, Tomohide Kitamura, Kazuhiro Kobayashi, Hisatoshi Konishi, Osamu Morikawa

Publikováno v: ChemInform. 27

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69ca9b46cddf6f82bdf15d937d0c0358
https://doi.org/10.1002/chin.199626148

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ChemInform Abstract: Ceric Ammonium Nitrate Mediated Cycloaddition of Hydroxyquinones with Alkenes for the One-Step Construction of Furoquinone Derivatives

Autor: Kazuhiro Kobayashi, Hisatoshi Konishi, Osamu Morikawa, Masako Mori, Tomokazu Uneda

Publikováno v: ChemInform. 27

A one-step formation of furoquinones, such as naphtho[2,3-b]furan-4,9-dione, naphtho[1,2-b]furan-4,5-dione, benzofuran-4,7-dione, and benzofuran-4,5-dione derivatives, by the ceric ammonium nitrate mediated [3+2] type cycloaddition of 2-hydroxy-1,4-n

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::110dfd1eed750e7bf28d7a50c2f54fb3
https://doi.org/10.1002/chin.199643078

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