(±)-Oudenone, 2-(tetrahydro-5-propyl-2-furylidene)-1,3-cyclopentanedione, was conveniently synthesized by BF3-catalyzed acylation of 1,3-cyclopentanedione with 4-chloroheptanoic anhydride and subsequent cyclization with triethylamine in a 36% overall yield.
(±)-Oudenone, 2-(tetrahydro-5-propyl-2-furylidene)-1,3-cyclopentanedione,通过
BF3 催化
1,3-环戊二酮与
4-氯庚酸酐的酰化和随后与
三乙胺的环化反应方便地合成总产率为 36%。