申请人:Firmenich SA
公开号:US06586620B1
公开(公告)日:2003-07-01
The present invention discloses a process for the preparation of a compound according to formula
wherein R1 is a C3-C7 alkyl group and R2 is a C1 to C4, linear or branched, alkyl radical, more preferably a methyl group, characterized in that the process includes the isomerisation of an epoxide of formula
wherein R1 and R2 have the meaning given in formula (I), in the presence of an acidic isomerisation agent, a thermal treatment or a combination thereof. The process according to the invention allows the preparation of the cyclopentenyl compounds of formula (I) on an industrial scale. The compounds are important starting products for the production of appreciated perfuming ingredients in particular methyl dihydrojasmonates.
本发明揭示了一种制备式中R1为C3-C7烷基,R2为C1-C4线性或支链烷基,更偏好为甲基基团的化合物的方法,其中该方法包括在酸性异构化剂、热处理或二者的组合存在下,对式中R1和R2具有公式(I)中所给含义的环氧化物进行异构化。本发明的方法允许工业规模制备公式(I)的环戊烯基化合物。这些化合物是生产重要的香料成分,特别是甲基二氢茉莉酸酯的起始物质。