α-Cyperone (II) was reduced to eudesma-4, 11-dien-3β-ol (III), which was converted into 4β, 5β-oxidoeudesm-11-en-3β-ol (V). Treatment of the epoxide (V) with boron trifluoride gave eudesm-11-en-3-on-5β-ol (IX) but no cyperolone (I). The epoxy-alcohol (V) was acetylated to afford the acetoxy-epoxide (XII) which on treatment with boron trifluoride yielded 5α-fluoro-3β-acetoxyeudesm-11-en-4β-ol (XIV) and 1 (R)-isopropenyl-3-(1-methyl-4 (S)-acetoxy-5-oxohexylidene) cyclopentane (XV) but no cyperolone acetate (XXIV). Oxidation of the epoxy-alcohol (V) gave the keto-epoxide (VIII) which was treated with boron trifluoride to yield cyper-11-ene-3, 4-dione (XVI). On reduction the dione (XVI) afforded mainly cyper-11-ene-3β, 4ξ-diol (XIX) and cyper-11-ene-3α, 4ξ-diol (XX). The diol (XIX) was transformed to the 3β-acetoxycyper-11-en-4-one (XXIV) via 3β-acetoxycyper-11-en-4ξ-ol (XXII). Alkaline-catalyzed hydrolysis of the acetate (XXIV) furnished cyperolone (I). The diol (XX) was converted into 3β-acetoxycyper-11-en-4-one (XXVII) via 3β-acetoxycyper-11-en-4ξ-ol (XXV). When hydrolyzed with an excess of alkali the acetate (XXVII) gave cyperolone (I), while hydrolysis with an insufficient amount of alkali produced 3-epi-cyperolone (XXVIII). On alkaline treatment, 3-epi-cyperolone (XXVIII) was epimerized to give cyperolone (I).
α-Cyperone (II) 被还原为 eudesma-4, 11-dien-3β-ol (III),其转化为 4β, 5β-oxyoeudesm-11-en-3β-ol (V)。用
三氟化硼处理
环氧化物 (V) 得到 eudesm-11-en-3-on-5β-ol (IX),但没有香柏酮 (I)。将环氧醇(V)乙酰化以提供乙酰氧基-
环氧化物(XII),其用
三氟化硼处理后产生5α-
氟-3β-乙酰氧基eudesm-11-en-4β-醇(XIV)和1(R)-异
丙烯基-3-(1-甲基-4(S)-乙酰氧基-5-氧代亚己基)
环戊烷(XV),但没有
乙酸赛哌隆(XXIV)。环氧醇(V)的氧化得到酮
环氧化物(VIII),将其用
三氟化硼处理得到环-11-烯-3,4-二酮(XVI)。还原时,二酮(XVI)主要提供cyper-11-ene-3β、4Ψ
-二醇(XIX)和cyper-11-ene-3α、4Ψ
-二醇(XX)。将二醇(XIX)经由3β-acetoxycyper-11-en-4Ψ-ol (XXII)转化为3β-acetoxycyper-11-en-4-one (XXIV)。
乙酸酯(XXIV)的碱催化
水解提供赛哌隆(I)。二醇(XX)通过3β-acetoxycyper-11-en-4Ψ-ol (XXV)转化为3β-acetoxycyper-11-en-4-one (XXVII)。当用过量的碱
水解时,
乙酸酯(XXVII)产生香柏酮(I),而用不足量的碱
水解产生3-表-香柏酮(XXVIII)。在碱处理时,3-表-香柏隆(XXVIII)差向异构化,得到香柏隆(I)。