Synthesis and ring-opening reaction of novel 1,3-dehydroadamantanes possessing phenyl and alkoxyl substituents
作者:Sotaro Inomata、Yusuke Harada、Shin-ichi Matsuoka、Takashi Ishizone
DOI:10.1016/j.tet.2013.02.042
日期:2013.4
3-Dibromoadamantanes carrying phenyl or alkoxyl substituents were converted into the corresponding DHAs via the intramolecular Wurtz-type coupling reactions with lithium metal in THF in 23–62% yields. Ring-opening reactions of DHAs readily occurred with acetic acid or methanol under acidic conditions to form various 1-acetoxyadamantanes or 1-methoxyadamantanes containing phenyl or alkoxyl groups. The resulting 1
一系列具有苯基或烷氧基取代基的新型1,3-脱氢金刚烷(DHA),例如5-苯基-1,3-脱氢金刚烷,5-丁基-7-苯基-1,3-脱氢金刚烷,5-甲氧基-1,合成3-脱氢金刚烷,5-丁氧基-1,3-脱氢金刚烷,5-丁基-7-甲氧基-1,3-脱氢金刚烷和5-丁氧基-7-丁基-1,3-脱氢金刚烷,并使其与酸性反应。化合物。带有苯基或烷氧基取代基的1,3-二溴金刚烷通过分子内的Wurtz型偶合反应与锂金属在THF中的转化成相应的DHA,产率为23-62%。DHA的开环反应很容易在酸性条件下与乙酸或甲醇发生,形成各种含有苯基或烷氧基的1-乙酰氧基金刚烷或1-甲氧基金刚烷。所得的1-丁基-3-甲氧基-5-苯基金刚烷,1-乙酰氧基-3-丁基-5-苯基金刚烷,1-乙酰氧基-3-丁基-5-甲氧基金刚烷,1-乙酰氧基-3-丁氧基-5-丁基金刚烷和1-丁氧基-3-丁基-5-甲氧基金刚烷具有立体异构性中央。DHA中反式的1