Výsledky vyhledávání - "Shahid B. Usmani"

A New Method for Installation of Aryl and Alkenyl Groups onto a Cyclopentene Ring and Synthesis of Prostaglandins

Autor: Yuichi Kobayashi, Eisuke Takahisa, Miwa Nakano, Takayuki Ainai, Shahid B. Usmani, Modachur G. Murugesh

Publikováno v: J. Org. Chem.. 67(No. 20):7110-7123

To construct a new strategy for synthesis of cyclopentanoids, the transition metal-catalyzed coupling reaction of cis 4-cyclopentene-1,3-diol monoacetate 1 with hard nucleophiles, R(T)-m, was investigated (eq 1 in Chart 1). Although preliminary exper

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67fb4256e69a7aff5a25d52c223e8ad3
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100472820

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Coupling Reaction of 4-Cyclopentene-1,3-diol Monoacetate and Lithium Alkenylborates and Its Application to Chiral Synthesis of Prostaglandin Intermediates

Autor: Eisuke Takahisa, Shahid B. Usmani, Yuichi Kobayashi

Publikováno v: Tetrahedron Lett.. 39:601-604

Lithium alkenylborates couple with the monoacetate of 4-cyclopentene-1,3-diol under the nickel catalyst regioselectively and stereospecifically to afford trans 1,3-isomers in good yields. Moreover, an unexpectedly high level of regio-selectivity is o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ce39f6b0652fa2bb756d190776226a29
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100417867

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Realization of High Regioselectivity in the Coupling Reaction of a Cyclopentadiene Monoepoxide Equivalent and Aryl Nucleophiles

Autor: Eisuke Takahisa, Shahid B. Usmani, Yuichi Kobayashi

Publikováno v: Tetrahedron Lett.. 39:597-600

Coupling reaction of monoacetate 2 and aryl hard nucleophiles is realized for the first time, which consists of the lithium arylborates as hard nucleophiles and NiCl2(PPh3)2 as a catalyst. More importantly, the independent effects of t-BuCN and NaI a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::df3ca0f0e5f4f01f66a77230d1bcb2d8
http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100417868

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ChemInform Abstract: Realization of High Regioselectivity in the Coupling Reaction of a Cyclopentadiene Monoepoxide Equivalent and Aryl Nucleophiles

Autor: Shahid B. Usmani, Eisuke Takahisa, Yuichi Kobayashi

Publikováno v: ChemInform. 29

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82d70895c73db3abf8b7f8a9a1053314
https://doi.org/10.1002/chin.199818089

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ChemInform Abstract: Coupling Reaction of 4-Cyclopentene-1,3-diol Monoacetate and Lithium Alkenylborates and Its Application to Chiral Synthesis of Prostaglandin Intermediates

Autor: Shahid B. Usmani, Yuichi Kobayashi, Eisuke Takahisa

Publikováno v: ChemInform. 29

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8366ce02e71527d0d2554adf1c8de41d
https://doi.org/10.1002/chin.199819081

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