Process for preparing 2-cyclopentenone derivative and perfume
申请人:Otsuka Kagaku Yakuhin Kabushiki Kaisha
公开号:US04237308A1
公开(公告)日:1980-12-02
A process for preparing 2-cyclopentenone derivative represented by the formula ##STR1## wherein A is ##STR2## and R.sub.2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and perfume composition containing the derivative.
A 2-cyclopentenone derivative represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and R.sub.4 is 2-pentenyl or 2-pentynyl, and process for preparing the same.
A cyclopentanol derivative represented by the formula ##STR1## wherein R.sub.1 and R.sub.2 are lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and R.sub.4 is 2-pentenyl or 2-pentynyl, and process for preparing the same.
A 2-(2-pentynyl) cyclopentanol derivative represented by the formula ##STR1## wherein R.sub.2 is lower straight-chain or branched-chain alkyl, alkenyl or aralkyl, and process for preparing the same.
A new method for synthesis of allenes, including an optically active form, from aldehydes and alkenyl aryl sulfoxides by sulfoxide–metal exchange as the key reaction and an application to a total synthesis of male bean weevil sex attractant
The sulfoxide–metal exchange reaction of β-acetoxy sulfoxides or β-mesyloxy sulfoxides, which were derived from alkenyl aryl sulfoxides and aldehydes in two steps, with a Grignard reagent or alkyllithium at low temperature gave allenes in good yields. Optically active allenes were synthesized starting from optically active 2-substituted ethenyl p-tolyl sulfoxides. A synthesis of (−)-methyl (E)-2,4