Zobrazeno 1 - 10 of 877 pro vyhledávání: '"Keiichiro Fukumoto"'
1
A novel strategy for the enantioselective synthesis of the steroidal framework using cascade ring expansion reactions of small ring systems-asymmetric total synthesis of (+)-equilenin
Autor: Masataka Ihara, Hideo Nemoto, Masahiro Yoshida, Keiichiro Fukumoto
Publikováno v: Tetrahedron Letters. 40:907-910
Enantioselective synthesis of (+)-equilenin ( 1 ) utilizing a novel strategy is described. The key steps are two cascade ring expansion reactions of small ring systems; 1) chiral (salen)Mn III complex-catalyzed cascade reaction of cyclopropylidene; 2
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::860ae0895fab36491855249a20b2eb26
https://doi.org/10.1016/s0040-4039(98)02479-4
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3
Total Synthesis of (±)-Methyl Atis-16-en-19-oate via Homoallyl−Homoallyl Radical Rearrangement
Autor: Masataka Ihara, Masahiro Toyota, Keiichiro Fukumoto, Toshihiro Wada
Publikováno v: Journal of the American Chemical Society. 120:4916-4925
Total synthesis of (±)-methyl atis-16-en-19-oate (5c), a tetracyclic diterpenoid possessing a bicyclo[2.2.2]octane ring system, was accomplished. Intramolecular Diels−Alder reaction of tetraene 14 was employed in a construction of kaurene skeleton
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1c0b21e8fb50a2c347fbb24842fedd89
https://doi.org/10.1021/ja9739042
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4
A Novel Palladium-Mediated Cascade Reaction Triggered by Strain Release of the Cyclobutane System. A New General Route to Benzo- and Naphthohydrindans
Autor: Hideo Nemoto, Keiichiro Fukumoto, Junji Miyata, and Naomi Raku, Masahiro Yoshida
Publikováno v: The Journal of Organic Chemistry. 62:7850-7857
A novel palladium-mediated cascade reaction was reported. By this procedure, the olefinic cyclobutanols 17, 24, and 31; 41; 37; and 45 afforded the benzo- and naphthohydrindans (46−49, 50−53, 54−57, and 58−61) respectively in one operation in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7ed4e31a577666878e326054d6d5d78
https://doi.org/10.1021/jo971377z
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6
Stereoselective synthesis of (±)-cedranediol via intramolecular double michael reaction
Autor: Masataka Ihara, Kei Makita, Keiichiro Fukumoto
Publikováno v: Tetrahedron Letters. 38:5197-5200
Total synthesis of (±)-cedranediol ( 7 ) was achieved using intramolecular double Michael reaction. Heating the enone 10 together with ZnCl 2 , Et 3 N, and TMSCl gave the tricyclo[5.2.1.0 1,5 ]decane 9 as a single diastereomer, which was converted i
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1e6256d1f7f4b2dcabc72331ce9ab784
https://doi.org/10.1016/s0040-4039(97)01126-x
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7
Influence of a 2-fluoro substituent on diastereoselectivity in the 1,3-dipolar cycloadditions of nitrones
Autor: Y. Tokunaga, Naoki Takahashi, Masataka Ihara, Keiichiro Fukumoto, Yuko Tanaka
Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :3043-3052
It is clear that the role of 1,2-asymmetric induction on the 1,3-dipolar cycloaddition of nitrones is influenced by the presence of a fluorine atom at the C-2 position. 2-Fluoro nitrones, synthesized by three different methods, have been subjected to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::230320289c88083c74bca137142e4082
https://doi.org/10.1039/a702810e
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8
A mild oxidative transformation of nitro compounds into ketones by tetrapropylammonium perruthenate
Autor: Masataka Ihara, Keiichiro Fukumoto, Y. Tokunaga
Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :207-210
Oxidation of secondary nitro compounds with a catalytic amount of tetrapropylammonium perruthenate in the presence of N-methylmorpholine N-oxide, silver(I) acetate, potassium carbonate and 4 A molecular sieves provides the corresponding ketones in mo
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::efe8be230f757273a79567cc5dc6e49f
https://doi.org/10.1039/a606332b
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9
Synthesis of chiral intermediates of quinine alkaloids and (+)-dihydroantirhine
Autor: Nobuaki Taniguchi, Masataka Ihara, Keiichiro Fukumoto
Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :365-370
(4R,5R)-2-Ethoxy-5-ethyl-4-methoxycarbonylmeth yl-3,4,5,6-tetrahydro-2H-pyran 3, which has been enantioselectively prepared, is converted into the cis-substituted lactone 11 by treatment with propanedithiol in the presence of boron trifluoride–diet
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::05db1b8506358c41a1282ce073fbeb8f
https://doi.org/10.1039/a606952e
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10
A sequenced radical reaction—A novel stereocontrolled route to angularly disubstituted cis-decalins
Autor: Motohiro Shiraki, N. Raku, Hideo Nemoto, Keiichiro Fukumoto, Naoki Yamada
Publikováno v: Tetrahedron. 52:13339-13346
The complete stereocontrolled synthesis of angularly disubstituted cis -decalins based on the sequenced radical ring expansion and cyclization process of α-iodomethylcyclopentanones 1 and 6 is described and the stereochemical outcome of this radical
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12c65958ad57f02871e68c160b49c7c8
https://doi.org/10.1016/0040-4020(96)00793-4
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