A new, general synthetic method of six-membered carbocycles has been demonstrated, which involves the stereocontrolled cyclization of olefinic epoxides with methylaluminum bis(4-bromo-2,6-di-t-butylphenoxide) (MABR) via the epoxide rearrangement and subsequent intramolecular ene reaction with high stereoselectivity. This strategy is shown to be highly useful in the stereoselective synthesis of the basic skeleton of various terpenes.
该方法涉及烯烃
环氧化物与双(4-
溴-2,6-二
叔丁基苯氧基)甲基铝(MABR)通过
环氧化物重排和随后的分子内烯化反应的立体控制环化,具有很高的立体选择性。研究表明,这种策略在立体选择性合成各种萜烯的基本骨架方面非常有用。