89064-06-2Relevant articles and documents
BF3-induced cyclobutane-opening of verbenone and its deconjugate homolog. Efficient preparation of o-mentha-1,8-dien-3-one and o-menth-1-en- 3-one in optically active forms
Kusakari, Takashi,Ichiyanagi, Tsuyoshi,Kosugi, Hiroshi,Kato, Michiharu
, p. 339 - 346 (2007/10/03)
Starting with (+)-verbenone, readily obtainable from (+)-nopinone, enantioselective preparation of (S)-(+)-4-isopropenyl-, (S)-(-)-4-isopropyl- and (R)-(+)-4-(1-acetoxy-1-methylethyl)-3-methyl-2-cyclohexen-1-ones was accomplished with little loss of stereochemical integrity via BF3-induced cyclobutane-opening of (+)4-(methylene)nopinone. As we have developed an efficient chemical transformation of (+)-nopinone into (-)-verbenone, the present syntheses of the above cyclohexenones are formal syntheses of their enantiomers from (+)-nopinone.
STEREOSELECTIVE TOTAL SYNTHESIS OF (4S)-trans-β-ELEMENONE FROM (S)-2-CYCLOHEXEN-1-OL
Sato, Toshio,Gotoh, Yoshihiko,Watanabe, Makoto,Fujisawa, Tamotsu
, p. 1533 - 1536 (2007/10/02)
Stereoselective first total synthesis of (4S)-trans-β-elemenone was achieved from (S)-2-cyclohexen-1-ol, prepared easily by the asymmetric reduction of 2-cyclohexen-1-one with chiral hydride reagent.