申请人:Otsuka Kagaku Yakuhin Kabushiki Kaisha
公开号:US04384144A1
公开(公告)日:1983-05-17
A process for preparing cyclopentenone derivatives represented by the formula: ##STR1## wherein R.sub.1 is methyl or ethyl, and R.sub.2 is hydrogen, methyl or acetyl, characterized in that a 1,4-diketone derivative represented by the formula: R.sub.1 COCH.sub.2 CH.sub.2 COCH.sub.2 OR.sub.2 wherein R.sub.1 and R.sub.2 are as defined above is cyclized in the presence of a basic catalyst.
一种制备环戊烯酮衍生物的方法,其化学式为:##STR1## 其中R.sub.1为甲基或乙基,R.sub.2为氢,甲基或乙酰基,其特征在于在碱性催化剂的存在下,将化学式为R.sub.1 COCH.sub.2 CH.sub.2 COCH.sub.2 OR.sub.2的1,4-二酮衍生物环化。其中R.sub.1和R.sub.2如上所定义。