Symmetrically Tetrasubstituted [2.2]Paracyclophanes: Their Systematization and Regioselective Synthesis of Several Types of Bis-Bifunctional Derivatives by Double Electrophilic Substitution
作者:Natalia V. Vorontsova、Valeria I. Rozenberg、Elena V. Sergeeva、Evgenii V. Vorontsov、Zoya A. Starikova、Konstantin A. Lyssenko、Henning Hopf
DOI:10.1002/chem.200701683
日期:2008.5.19
the respective achiral diphenol 12 and bis(methoxycarbonyl) 40 derivatives of the pseudo-para-structure retain regioselectivities which are characteristic for their pseudo-meta-regioisomers. Imino ligands 26, 25, and 39, which were obtained from monoacyl- 22 and diacyldihydroxy[2.2]paracyclophanes 21, 38, are tested as chiral ligands in stereoselective Et(2)Zn addition to benzaldehyde producing 1-phenylpropanol
具有不同类型的对称性(C(2),C(i),C(s),C(2v),C(2h))的手性和非手性四取代[2.2]对环环烷酮的可能数目,并进行评估,得出一个统一的,无关紧要的介绍了命名描述符系统。手性伪-元和非手性伪-对-二取代的[2.2]对环环亲电子的亲电取代的反应性和区域选择性以一种建议用于合成双-双官能[2.2]对环环烯的一般方法进行研究。手性伪-间-二羟基[2.2]对环环烷14与乙酰氯的单-和二酰化发生在邻位区域选择性生成三22、23和21个对称的四取代的酰基衍生物。与苯甲酰氯的相同反应既不具有区域选择性,也不具有化学选择性,并且会生成邻位/对位的混合物,单-/二酰化的化合物27-31。伪-间-二甲氧基[2.2]对环环烷18的双酰化是完全对位选择性的。伪元-双(甲氧羰基)[2.2]对环环烷20的亲电取代区域选择性地产生伪宝石取代模式。该底物的甲酰化仅产生单羰基衍生物35,而通过改变反应条件