本論文研究掩飾鄰苯醌(masked o-benzoquinones)與7-甲氧基- 4-乙烯基-1,2-二氫萘的分子間Diels-Alder反應,並利用此方法建立octahydrochrysenes的骨架。本研究以2-甲氧基酚衍生物1a-c為起始物,經二乙醯氧基碘苯(DAIB)氧化後產生掩飾鄰苯醌2a-c,再分別與雙烯劑5進行分子間Diels-Alder反應,生成環加成的產物,其中以第三位置和第四位置為CO2Me的掩飾鄰苯醌做為雙烯劑而生成的雙環[2.2.2]辛烯酮類化合物3a, 3b,另一種是第四位置為CO2Me和第二位置為OMe、第四位置為CO2Me的掩飾鄰苯醌做為親雙烯劑而生成的八氫䓛類化合物4a、4c;本研究發現雙環[2.2.2]辛烯酮類化合物3a可在220 oC加熱的條件下經由Cope重排反應轉化成八氫䓛類化合物4a。
The thesis concerns with the intermolecular Diels-Alder reactions of masked o-benzoquinones (MOBs) with 7-methoxy-4-vinyl- 1, 2-dihydronaphthalene and it attemps to construct octahydrochrysenes skeleton by this methodology. Masked o-benzoquinones (MOBs) 2a-c generated in situ from 2-methoxyphenols 1a-c underwent intermolecular Diels-Alder reactions with diene 5 via two different reaction mode. MOB 2a (R2=R3=H, R4=CO2Me) and 2b (R2=R4=H, R3=CO2Me) acted as diene during Diels-Alder reactions and formed. MOB 2c (R2=OME, R3=H, R4= CO2Me) reacted as dienophile with diene 5 to form octahydrochrysenes 4a,4c. The results showed that bicyclo[2.2.2]octenone 3a undergo Cope rearrangement under 220 oC to form octahydrochrysene 4a.