Výsledky vyhledávání - "Norio Tokutake"

Stereoselective Reactions. XXXIII. Design and Synthesis of Chiral Bidentate Amines Having a Bulky Group on the Chiral Carbon

Autor: Kenji Koga, Masaharu Toriyama, Norio Tokutake

Publikováno v: Chemical and Pharmaceutical Bulletin. 49:330-334

Based on the solution structures of chiral bidentate lithium amides ((R)-3a,b) having a phenyl group on the chiral carbon, chiral bidentate amines ((R)-5a,b-8a,b and (S)-9a,b) having a bulkier group instead of a phenyl group on the chiral carbon were

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a9f68e79d50a9befbe905e838e4e297
https://doi.org/10.1248/cpb.49.330

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Stereoselective Reactions. XXXIV.1) Enantioselective Deprotonation of Prochiral 4-Substituted Cyclohexanones Using Chiral Bidentate Lithium Amides Having a Bulky Group Instead of a Phenyl Group on the Chiral Carbon

Autor: Keizo Sugasawa, Norio Tokutake, Masaharu Toriyama, Shigeyasu Motohashi, Kenji Koga

Publikováno v: CHEMICAL & PHARMACEUTICAL BULLETIN. 49:468-472

Using chiral bidentate lithium amides having a bulky group instead of a phenyl group on the chiral carbon, enantioselective deprotonation of prochiral 4-substituted cyclohexanones in the presence of excess trimethylsilyl chloride was examined in THF

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::50ecc437d78a71b1ab18055ae67e8257
https://doi.org/10.1248/cpb.49.468

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Asymmetric Synthesis of Heptacosane-6,8-Diols Induced by Chiral Sulfoxides

Autor: Shigeyasu Motohashi, Michio Takido, Toshihiro Akihisa, Norio Tokutake, Ryota Nishioka, Ken Yasukawa, Torn Takagi

Publikováno v: Synthetic Communications. 30:4467-4472

The asymmetric synthesis of (6S,8R)-, (6S,8S)-, (6R,8S)- and (6R,8R)-heptacosane-6,8-diols from (2S)-, (2R)-1-[(R)-p-tolylsulfinyl]-2-heptanols and 1-icosanal is described.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51eb77f0ce55ee55db4e9925df7b7d26
https://doi.org/10.1080/00397910008087074

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Alkane diols from flower petals of Carthamus tinctorius

Autor: Shigeyasu Motohashi, Toshihiro Akihisa, Akiko Nozaki, Yoshimasa Kasahara, Ken Yasukawa, Norio Tokutake, Michio Takido, Toshitake Tamura, Youhei Inoue, Kunio Kumaki

Publikováno v: Phytochemistry. 45:725-728

Eleven novel secondary alkane-1,3-diols were isolated from a methanol extract of dried flower petals of Carthamus tinctorius . Their structures were determined to be syn ( R , S and/or S , R )-C 36 -alkane-6,8-diol, syn -C 28 -, C 30 -, C 32 , C 34 ,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::46a2471acbc6bec01788fb8c858728d4
https://doi.org/10.1016/s0031-9422(97)00067-8

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Stereochemistry of enantioselective deprotonation of 4-substituted cyclohexanones by chiral bidentate lithium amides

Autor: Mitsuru Shindo, Kenji Koga, Masaharu Toriyama, Norio Tokutake, Keizo Sugasawa

Publikováno v: Tetrahedron Letters. 38:567-570

Enantioselective deprotonation of 4-substituted cyclohexanones (1) in the presence of excess trimethylsilyl chloride was examined using chiral bidentate lithium amides ((R)-3∼(R)-7) in THF. The solution structures of (R)-3a in THF in the presence a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::306f3835aab0a51787ad23ee00248cc6
https://doi.org/10.1016/s0040-4039(96)02373-8

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The asymmetric favorskii rearrangement: A synthesis of optically active α-alkyl amides from aldehydes and (−)-1-chloroalkyl p-tolyl sulfoxide

Autor: Koji Yamakawa, Tsuyoshi Satoh, Sachiko Kimura, Norio Tokutake, Shigeyasu Motohashi

Publikováno v: Tetrahedron Letters. 34:4823-4826

The first asymmetric Favorskii rearrangement is described. Optically active α-alkyl amides of enantiomeric excess up to 94% were realized from aldehydes and optically active (−)-1-chloroalkyl p-tolyl sulfoxides via the Favorskii rearrangement of o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f3e51230cf75d1c3ee99a22635d05ee
https://doi.org/10.1016/s0040-4039(00)74098-6

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