Výsledky vyhledávání - "Kazuhisa Funakoshi"

Enantio- and diastereoselective construction of 4,9-dimethylspiro[4.4]nonane-2,7-dione using Rh-catalyzed asymmetric cyclization

Autor: Masakazu Tanaka, Kiyoshi Sakai, Hiroshi Suemune, Masanori Imai, Akiko Matsui, Kazuhisa Funakoshi, Masakazu Fujio, Eishi Sakamoto, Miyuki Takahashi

Publikováno v: Tetrahedron. 57:1197-1204

Asymmetric cyclization using Rh-complexes was applied to the synthesis of 4,9-dimethylspiro[4.4]nonane-2,7-diones. The spiro[4.4]nonane skeleton bearing a chiral quaternary carbon could be stepwisely constructed by using Rh-catalyzed cyclization twic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c9131e2f85b36ba6e413a5e617a3cfe6
https://doi.org/10.1016/s0040-4020(00)01106-6

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Application of Rh-catalyzed cyclization for the construction of three consecutive chiral carbons in 4,9-dimethylspiro[4.4]nonane-2,7-dione

Autor: Akiko Matsui, Masakazu Tanaka, Hiroshi Suemune, Kiyoshi Sakai, Miyuki Takahashi, Masanori Imai, Eishi Sakamoto, Kazuhisa Funakoshi

Publikováno v: Tetrahedron Letters. 41:7879-7883

Asymmetric cyclization using Rh-complexes has been applied to the synthesis of 4,9-dimethylspiro[4.4]nonane-2,7-diones. The spiro[4.4]nonane skeleton bearing three consecutive chiral carbons could be stepwisely constructed from an identical starting

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::98cb4f6896ab111e9da264b48bd65e5b
https://doi.org/10.1016/s0040-4039(00)01315-0

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Concurrent Induction of Two Chiral Centers from Symmetrical 3,4-Disubstituted and 3,3,4-Trisubstituted 4-Pentenals Using Rh-Catalyzed Asymmetric Cyclizations

Autor: Masakazu Tanaka, Xiao-Ming Wu, Kazuhisa Funakoshi, Masanori Imai, Kiyoshi Sakai, Masakazu Fujio, Yasuko Eto-Kato, Miyuki Takahashi, Eishi Sakamoto, Hiroshi Suemune

Publikováno v: The Journal of Organic Chemistry. 65:5806-5816

Asymmetric cyclization of symmetrical 3,4-disubstituted and 3,3, 4-trisubstituted 4-pentenals was studied using Rh-complexes with chiral ligands. The cyclization of symmetrical 4-pentenals 4a,b by a neutral Rh[(R)-BINAP]Cl afforded cis-3,4-disubstitu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59751fd091e45cc9038227f0b7488fb9
https://doi.org/10.1021/jo000781m

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Highly diastereoselective, enantioselective cyclization of symmetrical 3,4-disubstituted 4-pentenal using chiral rhodium(I)-complex

Autor: Kiyoshi Sakai, Xiao-Ming Wu, Kazuhisa Funakoshi

Publikováno v: Tetrahedron Letters. 34:5927-5930

Concurrent introduction of two chiral centers at 3,4-positions of cyclopentanone from symmetrical 1 was achieved in diastereoselective and enantioselective fashion by combination of BINAP and cationic Rh(I)(or neutral).

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::53541c8076fdcccbf8b6efe330992d73
https://doi.org/10.1016/s0040-4039(00)73816-0

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Insight into Rh(I)-catalyzed cyclization of 6-octen-1-als with a chiral protecting group

Autor: Kazuhisa Funakoshi, Asako Matsuda, Ichiro Koga, Kiyoshi Sakai

Publikováno v: Tetrahedron: Asymmetry. 4:1857-1868

Rh(I)(Wilkinson)[ClRh(PPh3)3]-catalyzed cyclization of 6-octen-1-als with a chiral protecting group at the C2-position afforded only cis-cyclohexanol derivatives, and in the case of C4-position yielded a mixture of cis and trans cyclohexanol. These f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::744da5e19498ee4475ac6c52136cf39a
https://doi.org/10.1016/s0957-4166(00)80426-7

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ChemInform Abstract: Asymmetric Cyclization Reactions. Cyclization of Substituted 4- Pentenals into Cyclopentanone Derivatives by Rhodium(I) with Chiral Ligands

Autor: Yukari Taura, Xiao-Ming Wu, Kazuhisa Funakoshi, Kiyoshi Sakai, Masakazu Tanaka

Publikováno v: ChemInform. 22

Asymmetric cyclization of substituted 4-pentenals ( Ia,b,c; IIa,b,c,d ) by Rh(I) with chiral ligands was tested, and substrate ( IId ) with a bulkier substituent at C 4 underwent more stereoselective cyclization by Rh(I)-((+)-DIPMC) to yield substitu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::68c731aa0b0bc15e8105ed7d667019a8
https://doi.org/10.1002/chin.199141103

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ChemInform Abstract: Insight into Rh(I)-Catalyzed Cyclization of 6-Octen-1-als with a Chiral Protecting Group

Autor: Asako Matsuda, Kazuhisa Funakoshi, Ichiro Koga, Kiyoshi Sakai

Publikováno v: ChemInform. 24

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bc459bbea2cdc2845aa5f3eb31b89d96
https://doi.org/10.1002/chin.199350096

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ChemInform Abstract: Highly Enantioselective Cyclization Using Cationic Rh(I) with Chiral Ligand

Autor: Kiyoshi Sakai, Kazuhisa Funakoshi, Xiao-Ming Wu

Publikováno v: ChemInform. 24

Highly diastereoselective cyclization (>99% de) of 3R (or S) 3,4-disubstituted 4-pentenals into the corresponding 3,4-cis(or trans)-disubstituted cyclopentanone and highly enantioselective cyclization (>99% ee) of 4-substituted 4-pentenals into 3-sub

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::26322d1abd7c3bb1a5db84ac8384914a
https://doi.org/10.1002/chin.199310055

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ChemInform Abstract: Highly Diastereoselective, Enantioselective Cyclization of Symmetrical 3,4-Disubstituted 4-Pentenal Using Chiral Rhodium(I) Complex

Autor: Kiyoshi Sakai, Xiao-Ming Wu, Kazuhisa Funakoshi

Publikováno v: ChemInform. 25

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0cf0733b8cf20d9ab1174977b3530282
https://doi.org/10.1002/chin.199404048

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