An efficient gram scale synthesis of the previously unknown 4,7-di-tert-butylacenaphthenone (3b) is reported. The facile isomerization of epoxide 9b to ketone 3b occurs simply on stirring a solution of 9b with silica gel at room temperature. Aldol cyclotrimerization of 3b with titanium tetrachloride gives 2,5,8,11,14,17-hexa-tert-butylde cacyclene (1b) in 58% isolated yield. X-ray crystal structures have been obtained for the synthetic intermediates 4,7-di-tert-butylacenaphthene (2b) and 4,7-di-tert-butylacenaphthylene (8b).Key words: aromatic, decacyclene, hydrocarbon, nonalternant, polycyclic.
本研究报告以克为单位高效合成了之前未知的 4,7-二叔丁基并环
苊酮 (3b)。只需在室温下搅拌 9b 与
硅胶的溶液,
环氧化物 9b 即可轻松异构化成酮 3b。3b 与
四氯化钛发生醛醇环三聚反应,得到 2,5,8,11,14,17-六叔丁基双环烯(1b),分离收率为 58%。合成中间体 4,7-二叔丁基
苊(2b)和 4,7-二叔丁基
萘(8b)的 X 射线晶体结构已经获得。