Titanocene(III)-Catalyzed 6-<i>exo</i>Versus 7-<i>endo</i>Cyclizations of Epoxypolyprenes: Efficient Control and Synthesis of Versatile Terpenic Building Blocks
作者:José Justicia、Tania Jiménez、Delia Miguel、Rafael Contreras-Montoya、Rachid Chahboun、Enrique Álvarez-Manzaneda、Daniel Collado-Sanz、Diego J. Cárdenas、Juan M. Cuerva
DOI:10.1002/chem.201302575
日期:2013.10.18
In this article, a complete study on the selectivity of titanocene(III) cyclization of epoxypolyprenes is presented. The requirements for the formation of six‐ or seven‐membered rings during these cyclizations are determined, taking into account the different substitution pattern in the epoxypolyprene precursor. Thus, a complete selectivity to 6‐exo or 7‐endo cyclization process has been achieved,
在本文中,对环氧聚戊二烯二茂钛(III)环化的选择性进行了完整的研究。确定这些环化过程中形成六元或七元环的要求,要考虑到环氧聚戊二烯前体中不同的取代方式。因此,已经实现了对6- exo或7- end环化过程的完全选择性,生成了单环,双环甚至三环化合物,为此类衍生物的开发提供了新的有效途径。另外,该方法为制备具有三取代氧合官能团的多环化合物的合成制备优异的结构单元提供了可能性,该化合物存在于几种天然萜烯中。