Development and Application of Novel Asymmetric Carbon-Carbon Bond Forming Reactions

碳骨架的控制，包括立体化学，是构建有用和复杂的有机分子的主要因素。本研究就是以开发新颖独特的多组分单质碳-碳键形成反应为研究内容的。本研究的结果和有用的信息将在下面进行综述。为了建立一个新的串联反应体系，设计了Wittig反应和Michael反应的组合，并考察了两个联萘衍生物的第一函数作为有效底物。进行了不对称Michael反应的初步实验，得到了较高的立体(对映体)选择性。随后尝试了以苯甲醛为捕获底物的Michael反应和HWE反应，得到了具有较高对映体选择性的产物。这种一瓶串联反应被成功地应用于双重不对称诱导。考察了新设计的HWE试剂在三种有效的不对称烯化反应中的能力，观察到了高的化学和光学产率的产物的形成，最后，串联的不对称Michael-HWE体系被有效地应用于动态动力学拆分，得到了令人满意的化学产率和高的非对映选择性。

Control of carbon skeleton including stereochemistry is a major factor for construction of useful and complex organic molecules. This study is involves in such a research work whose contents is development of novel and unique tantem carbon-carbon bond forming reactions of multi-components. The results and useful information obtained from this research work will be reviewed below.A combination of the Wittig and Michael reactions was designed for a new tandem reaction system and first function of two binaphthyl derivative was examined for effective substrate. A preliminary experiment of the asymmetric Michael reaction was carried out to give a high stereo(enantio) selectivity. Successively, the tandem Michael and HWE reaction was next tried using benzaldehyde as trapping substrate of the in situ generated carbanion giving the product with quite high enantioselectivity. This one-flask tandem reaction was successfully applied to double asymmetric induction. The ability of newly designed HWE reagent was investigated in three kinds of effective approaches for asymmetric olefination and the product formation with high both the chemical and optical yields was observed.Finally, the tandem asymmetric Michael-HWE system was efficiently applied to dynamic kinetic resolution to give the product in satisfactory chemical yield with high diastereo-selectivity.