中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,3-环氧-3,7-二甲基辛-6-烯醇 | [3-methyl-3-(4-methylpent-3-enyl)oxiran-2-yl]methanol | 50727-94-1 | C10H18O2 | 170.252 |
—— | 3,7-dimethyl-2,3-epoxy-1-iodooct-6-ene | 408318-03-6 | C10H17IO | 280.149 |
—— | 10,11-epoxy-3,7,11-trimethyldodeca-1,3E,6E-triene | 153580-68-8 | C15H24O | 220.355 |
The synthesis of conjugated trienes and related oxidation products of α- farnesene (1), principally from the epoxides of α- farnesene (1), is reported. Base-promoted ring opening of 6,7-epoxide (4) by KOBut/LiNPri2 affords the conjugated triene (2), whilst the 3,4-epoxide (5) affords trienol (7). In contrast, 10,11-epoxide (6) fails to undergo epoxide ring opening; it rearranges to the conjugated triene epoxide (8). Base-promoted ring opening of bisepoxide (9) afforded trienol epoxide (11) at -30°C, whilst cyclization to tetrahydrofurans (10a,b) occurred at room temperature. Photosensitized oxidation of 10,11-epoxide (6) followed by in situ treatment with acid gave the cyclic peroxide (3) and on reduction triol (12). Bisallylic alcohol (13) was prepared by alkylation of 3-methylsulfolene with geranial. Trienes (2) and (3) have been isolated previously as autoxidation products of α- farnesene (1) and are implicated as the causal agents of superficial scald of stored apples.