A convenient method for the [2+2+2] cyclotrimerisation of alkynes using Ti(OiPr)4/nBuLi is presented. Homotrimerisation of arylacetylenes proceeds within minutes with excellent regioselectivity. Moreover, the intermolecular construction of ABB heterotrimers can be achieved selectively from two different alkynes with similar electronic properties. The method is also suitable for the synthesis of pyridines.
本文介绍了一种使用Ti(OiPr)4/nBuLi进行[2+2+2]环三聚化的便捷方法。芳基
炔烃的同聚三聚在几分钟内进行,并且具有优异的区域选择性。此外,可以选择性地从两种具有相似电子特性的不同
炔烃中合成ABB异聚三聚物。该方法也适用于
吡啶的合成。