We have demonstrated the syntheses of enantiomerically enriched tricyclo[4.2.1.03,8]nonanes from Cs symmetric cyclohexanones by means of enantioselective deprotonation, followed by an intramolecular Michael–aldol reaction. The asymmetric deprotonation was achieved in up to 79% ee and the following Michael–aldol reaction gave the corresponding tricyclononanes with almost the same optical purity.
我们已经证明了通过对映选择性去质子化,然后通过分子内迈克尔-羟醛反应,由C s对称
环己酮合成对映异构体富集的
三环[4.2.1.0 3,8 ]
壬烷。在不超过79%ee的条件下实现了不对称的去质子化,随后的Michael-aldol反应给出了相应的三
环壬烷,其光学纯度几乎相同。