Towards a Catalytic Asymmetric Version of the [3+2] Cycloaddition between Hydrazones and Cyclopentadiene
作者:Svetlana Tsogoeva、Alexandru Zamfir
DOI:10.1055/s-0030-1260467
日期:2011.6
ved silicon Lewis acid, has been described for the [3+2] cycloaddition of N-benzoylhydrazone to cyclopentadiene to afford a cycloadduct in high diastereomeric ratio of 95:5 (syn/anti) and enantiomeric excess of 89%. These results provide insights in the future design and development of highly active and enantioselective silicon Lewis acids for this and other cycloaddition types. cycloaddition - silicon
已经描述了一种新颖且易于获得的无金属催化体系,即原位生成的BINOL-磷酸盐衍生的硅路易斯酸,用于N-苯甲酰hydr的[3 + 2]环加成反应生成环戊二烯,从而以高非对映异构体比例提供环加合物。 95:5(syn / anti)和对映体过量89%。这些结果为这种和其他环加成类型的高活性和对映选择性硅路易斯酸的未来设计和开发提供了见识。 环加成-硅-hydr-路易斯酸-氮杂环