2,4-Dienes are prepared in high yields with high regioselectivity by the codimerisation of acetylenes and alkenes in the presence of a catalytic amount of Ru(cod)(cot) at 80 °C cod = cycloocta-1,5-diene, cot = cycloocta-1,3,5,-triene.
bis(cyclometalated) ruthenium(II) catalyst precursors for CC coupling reactions between alkene and alkyne substrates. The complex [(cod)Ru(3‐methallyl)2] reacts with benzophenone imine or benzophenone in a 1:2 ratio to form bis(cyclometalated) ruthenium(II) complexes (1). The imine‐ligated complex 1 a promoted room‐temperature coupling between acrylic esters and amides with internal alkynes to form 1,3‐diene
描述了一类新的双(环金属化)钌 (II) 催化剂前体的开发,用于烯烃和炔烃底物之间的C C 偶联反应。配合物 [(cod)Ru(3-methallyl) 2 ] 与二苯甲酮亚胺或二苯甲酮以 1:2 的比例反应形成双(环金属化)钌 (II) 配合物 ( 1 )。亚胺连接的配合物1a促进了丙烯酸酯和酰胺与内部炔烃之间的室温偶联,形成 1,3-二烯产物。提议的催化循环包括通过氧化环化、β-氢化物消除和C H 键还原消除形成C C 键。这个 Ru II / Ru IV途径与观察到的1 a 的催化反应性一致,用于温和的尾对尾丙烯酸甲酯二聚反应和通过 [2+2] 降冰片烯/炔环加成形成环丁烯。
Neisius, N. Matthias; Plietker, Bernd, Angewandte Chemie - International Edition, 2009, vol. 48, p. 5752 - 5755
作者:Neisius, N. Matthias、Plietker, Bernd
DOI:——
日期:——
Ruthenium- and Rhodium-Catalyzed Ring-Opening Coupling Reactions of Cyclopropenones with Alkenes or Alkynes
作者:Teruyuki Kondo、Ryosuke Taniguchi、Yu Kimura
DOI:10.1055/s-0037-1609339
日期:2018.4
rhodium complexes, especially [RhCl(η 4 -1,5-cod)] 2 , show high catalytic activity for the desired cocyclization reactions to give the corresponding cyclopentenones in high yields and selectivities. In addition, [RhCl(η 4 -1,5-cod)] 2 realizes the catalytic ring-opening cocyclization of cyclopropenones with internal alkynes to give the corresponding cyclopentadienones. In all these reactions, ruthena-