MISC

2008年

Highly enantio- and s-trans C = C bond selective catalytic hydrogenation of cyclic enones: Alternative synthesis of (-)-menthol

CHEMISTRY-A EUROPEAN JOURNAL
  • Takashi Ohshima
  • ,
  • Hiroshi Tadaoka
  • ,
  • Kiyoto Hori
  • ,
  • Noboru Sayo
  • ,
  • Kazushi Mashima

14
7
開始ページ
2060
終了ページ
2066
記述言語
英語
掲載種別
DOI
10.1002/chem.200701505
出版者・発行元
WILEY-V C H VERLAG GMBH

A highly enantioselective catalytic hydrogenation of cyclic enones was achieved by using the combination of a cationic Rh-I complex, (S)5,5'-bis{di(3,5-di-tert-butyl-4-methoxyphenylphosphino)}-4,4'-bi-1,3-benzodioxole (DTBM-SEGPHOS), and (CH2CH2PPh3Br)(2), The presence of an s-cis C=C bond isopropylidene moiety on the cyclic enone influenced the enantioselectivity of the hydrogenation. Thus, the hydrogenation of 3-alkyl-6-isopropylidene-2-cyclohexen-1-one, which contains both s-cis and s-trans enones, proceeded in excellent enantioselectivity (up to 98% ee). To obtain high enantio- and s-trans selectivities, the addition of a halogen source to the cationic Rh complex was the essential step. With the key step of the s-trans selective asymmetric hydrogenation of piperitenone, we demonstrated a new synthetic method for optically pure (-)-menthol via three atom-economical hydrogenations. Moreover, we found that the complete s-trans and s-cis C=C bond selective reactions were also realized by the proper choice of both the chiral ligands and halides.

リンク情報
DOI
https://doi.org/10.1002/chem.200701505
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000253932900007&DestApp=WOS_CPL
ID情報
  • DOI : 10.1002/chem.200701505
  • ISSN : 0947-6539
  • eISSN : 1521-3765
  • Web of Science ID : WOS:000253932900007

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