Nobuhiko Ito
Toray Industries
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Featured researches published by Nobuhiko Ito.
Journal of The Chemical Society-perkin Transactions 1 | 1997
Nobuhiko Ito; Takeaki Etoh; Hisahiro Hagiwara; Michiharu Kato
Synthesis of 4-alkylidene-3,5,5-trimethylcyclohex-2-enones 7 has nbeen achieved utilising 1,4-conjugate dehydrobromination of allylic nbromides 5 as a key step. This chemical transformation is applied to the nsynthesis of degradation products of carotenoids: megastigmatrienones n7e/1–4, 4-methylene-3,5,5-trimethylcyclohex-2-enone 7a, n4-(3-hydroxybutylidene)-3,5,5-trimethylcyclohex-2-enone 9, n1,3,7,7-tetramethyl-2-oxabicyclo[4.4.0]dec-5-en-9-one 10a–b and n3,4,7,8-tetrahydro-4,4,7-trimethylnaphthalen-2(6H)-one n15. A novel photoisomerisation of n4-[(Z n)-3-acetoxybut-2-enyl]-4-hydroxy-3,5,5-trimethylcyclohex-2-enone 19 to n4-[(E n)-3-acetoxybut-2-enyl]-4-hydroxy-3,5,5-trimethylcyclohex-2-enone 20 nenables us to synthesise blumenol-A 21.
Journal of The Chemical Society-perkin Transactions 1 | 1996
Nobuhiko Ito; Takeaki Etoh
The endocyclic linearly conjugated dienolates from substituted cyclohex-2-enones react with but-3-en-2-one, substituted methyl propenoates, but-3-yn-2-one and methyl propiolate to afford bicyclo[2.2.2]-oct-2-en-1-ols 10a–c, 14a–c and bicyclo[2.2.2]octa-2,5-dien-1-ols 15a,b. The AlCl3-catalysed reaction of 3,5,5-trimethyl-1-(trimethylsiloxy)cyclohexa-1,3-diene 3 with (E)-4-acetoxy- and (E)-4-methoxy-but-3-en-2-one provides trans-8-acetoxy-7-acetyl-3,5,5-trimethyl-1-(trimethylsiloxy)bicyclo[2.2.2]oct-2-enes 22, 23 and trans-7-acetyl-8-methoxy-3,5,5-trimethyl-1-(trimethylsiloxy)bicyclo[2.2.2]oct-2-enes 24, 25. Starting from these bicyclo[2.2.2]octenes, the C13 degradation products of carotenoids including 3-oxo-α-ionone 20, blumenol-C 27 and 1,3,7,7-tetramethyl-2-oxabicyclo[4.4.0]decan-9-one 29 have been synthesized.
Synthesis | 1997
Nobuhiko Ito; Takeaki Etoh; Hisahiro Hagiwara; Michiharu Kato
Archive | 1997
Akio Hasebe; Seizo Imashiro; Nobuhiko Ito; Shigeru Wada; 聖三 今城; 信彦 伊藤; 繁 和田; 昭雄 長谷部
Archive | 1998
Akio Hasebe; Nobuhiko Ito; 信彦 伊藤; 昭雄 長谷部
Archive | 2006
Nobuhiko Ito; Eiji Takai; 信彦 伊藤; 英司 高井
Archive | 1999
Nobuhiko Ito; Kaori Kasahara; Hideo Nakanishi; Masaaki Ozaki; 秀夫 中西; 信彦 伊藤; 昌章 尾崎; 香織 笠原
Archive | 1998
Akio Hasebe; Nobuhiko Ito; Hiroyuki Okada; 信彦 伊藤; 博之 岡田; 昭雄 長谷部
Archive | 1995
Takeaki Etoh; Go Hata; Nobuhiko Ito; Tetsuya Katou
Archive | 2000
Nobuhiko Ito; Motoo Higashi; Yuki Konno; Hideaki Takaoka