Chemo- and Regioselective Intermolecular Cyclotrimerization of Terminal Alkynes Catalyzed by Cationic Rhodium(I)/Modified BINAP Complexes: Application to One-Step Synthesis of Paracyclophanes
作者:Ken Tanaka、Kazuki Toyoda、Azusa Wada、Kaori Shirasaka、Masao Hirano
DOI:10.1002/chem.200401017
日期:2005.2.4
the cationic rhodium(I)/DTBM-Segphos complex. This method can be applied to a variety of terminal alkynes to provide 1,2,4-trisubstituted benzenes in high yield and with high regioselectivity. A chemo- and regioselective intermolecular crossed-cyclotrimerization of dialkyl acetylenedicarboxylates with a variety of terminal alkynes has also been developed based on the use of the cationic rhodium(I)/H8-BINAP
基于阳离子铑(I)/ DTBM-Segphos配合物的使用,已开发出高度炔基选择性的末端炔烃分子间环三聚体。该方法可用于各种末端炔烃,以高产率和高区域选择性提供1,2,4-三取代的苯。基于阳离子铑(I)/ H8-BINAP络合物的使用,还开发了乙炔基二羧酸二烷基酯与各种末端炔烃的化学和区域选择性分子间交叉环三聚,可高产率提供3,6-二取代邻苯二甲酸酯。就催化活性,化学和区域选择性,底物范围和易于操作而言,它构成了一种高效的新方法,用于两种不同单炔的分子间交叉环三聚。通过将其应用于从相应的末端α,ω-二炔类化合物中一步合成[6]甲基环已烷和[7]-[12]对环已烯,证明了这种新的交叉炔烃环三聚方法的多功能性。机理研究表明,这种交叉炔烃环三聚的化学和区域选择性是由优先形成的衍生自末端炔烃和乙炔二羧酸二烷基酯的特定金属铑金属环决定的。