Vanillin和丙酮進行醛醇縮合反應得到dehydroz inger- one(14)。共軛不飽和羰化物(14)和各種直鏈 醛類在Lithium bis(trimethylsilyl)am ide為鹼性試劑下進行第二次醛醇 縮合反應得到〔n〕-dehyd roshogaols(7)和〔n〕-dehy- droginge rols(8)。直接將化合物(7)氫化後可得到〔n〕- para dols(11)和dehydroparadols(10),氧化後 可得 到環氧化合物(13)。化合物(8)氫化後得到〔n〕-gin gerols(3),經Swern氧化反應得到〔n〕-isodeh ydrogingerdiones(9)。〔n〕-gingerol s(3)在酸性下脫水可得到〔n〕-shogaols(4)。 Vanillin reacted with acetone throug h Aldol condensation to g ive dehydrozingerone(14? Lithium bis(trimethylsilyl)amide as bas e.condensation of compound(14)wi th alkylaldehydes afforded 〔n〕-d ehydroshogaols(7)and 〔n〕-dehydro gingerols(8). Catalyst hydrogena tion of compounds(7) yielded 〔n〕 -paradols(11)or 〔n〕-dehydroparad ols(10).Oxidation of compounds(7 ) gave epoxide compound(13). Cat alyst hydrogenation of compound( 8)gave 〔n〕-gingerols(3). Swern o xidation of compound(8)obtained 〔n〕-isodehydroging-erdiones(9). Dehydration of compounds﹛]3)with acid afforded 〔n〕-shogaols(4).
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