Výsledky vyhledávání - "Kenji Kawanishi"

ChemInform Abstract: The Directed ortho-Lithiation of Aryl Tetramethylphosphorodiamidates

Autor: Kenji Kawanishi, T. Hori, Sunao Furukawa, Mutsuhiro Date, Mitsuaki Watanabe

Publikováno v: ChemInform. 22

Aryl tetramethylphosphorodiamidates were effectively ortho-lithiated with sec-BuLi in tetrahydrofuran at −105 o C. The resulting lithiated species were trapped with a variety of electrophiles at −105 o C to provide ortho-substituted phosphorodiam

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d93696d52dc233b9765433b8718ff1fa
https://doi.org/10.1002/chin.199119220

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ChemInform Abstract: A Facile Synthesis of Benzo(b)thiophene Derivatives

Autor: Kenji Kawanishi, Ryuji Akiyoshi, Mitsuaki Watanabe, Mutsuhiro Date, Sunao Furukawa

Publikováno v: ChemInform. 22

Lithiation of S-(2-methylphenyl) N, N, N', N'- tetramethylphosphorodiamidothioate with sec-BuLi at #75105° gave the corresponding benzylic anion which was acylated with various aromatic esters to give various deoxybenzoin derivatives in moderate to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1f1134ea9cd95051b2aaedbec132606a
https://doi.org/10.1002/chin.199130163

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A short and convergent synthesis of the phytoalexins vignafuran, 6-demethylvignafuran, and moracin M via directed lithiation reaction

Autor: Sunao Furukawa, Kenji Kawanishi, Mitsuaki Watanabe

Publikováno v: Chemical and Pharmaceutical Bulletin. 39:579-583

2-Methyl-5-(tert-butyldimethylsilyloxy)phenyl N, N, N', N'-tetramethylphosphorodiamidate was lithiated with sec-BuLi in the presence of N, N, N', N'-tetramethylethylenediamine at -105°C to generate the corresponding benzylic anion. This benzylic ani

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e150b528a1f28564193eb570af89835a
https://doi.org/10.1248/cpb.39.579

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A facile synthesis of benzo(b)furan derivatives including naturally occurring neolignans via regioselective lithiation of ortho-cresols using the bis(dimethylamino)phosphoryl group as a directing group

Autor: Kenji Kawanishi, Mitsuaki Watanabe, Sunao Furukawa, Mutsuhiro Date, Takako Hori

Publikováno v: Chemical and Pharmaceutical Bulletin. 39:41-48

A facile synthesis of 2-arylbenzo[b]furans via directed lithiation of ortho-tolyl tetramethylphosphorodiamidates as the key step is described. Lithiation of ortho-tolyl tetramethylphosphorodiamidates at -105°C followed by reaction with aromatic este

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::75ae369312e706aa6e95dfb44f7a7c5d
https://doi.org/10.1248/cpb.39.41

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A Regioselective Lithiation of ortho-Cresols Using the Bis(dimethylamino)phosphoryl Group as a Directing Group: General Synthesis of 2,3-Dihydrobenzo(b)furans Including Naturally Occurring Neolignans

Autor: Ryuji Akiyoshi, Sunao Furukawa, Masami Watanabe, Kenji Kawanishi

Publikováno v: Chemical and Pharmaceutical Bulletin. 39:3123-3131

A general synthetic method was developed for 2-aryl-2, 3-dihydrobenzo[b]furans via regioselective lithiation of ortho-tolyl tetramethylphosphorodiamidates followed by addition of aromatic aldehydes as a key step. ortho-Tolyl tetramethylphosphorodiami

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aadd1acebbf7a9f4a72cadcf1c0f5601
https://doi.org/10.1248/cpb.39.3123

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