Use of Group 4 Bis(sulfonamido) Complexes in the Intramolecular Hydroamination of Alkynes and Allenes
作者:Lutz Ackermann、Robert G. Bergman、Rebecca N. Loy
DOI:10.1021/ja0361547
日期:2003.10.1
the intramolecularhydroamination of alkynes and allenes more efficiently than Cp-based species. We report here that electron-withdrawing and sterically demanding bis(sulfonamido) ligands lead to enhanced catalytic activity. Zirconium analogues have also been prepared, and the tosyl-substituted complex 20 has been structurally characterized. As in the titanium series, bis(sulfonamido) zirconium catalysts
A series of allenic tosylamides have been prepared and shown to undergo palladium(II)-catalyzed cyclization in the presence of lithium bromide and a copper(II) salt to give pyrrolidines. Palladium-catalyzed 1,2-oxidation of allenic lactams in the presence of LiBr and p-benzoquinone was also studied. (C) 2000 Elsevier Science Ltd. All rights reserved.
Intramolecular Palladium(II)-Catalyzed 1,2-Addition to Allenes
作者:Catrin Jonasson、Attila Horváth、Jan-E. Bäckvall
DOI:10.1021/ja001748k
日期:2000.10.1
were performed in the presence of LiBr with Pd(OAc)2 as the catalyst. Two different reoxidants, p-benzoquinone or Cu(OAc)2, were used, the choice of oxidant being dependent on the substrate. The reaction proceeds through an external nucleophilic attack (Br-) on a (π-allene)palladium complex to produce a (π-allyl)palladium intermediate. Subsequent intramolecular attack by the second internal nucleophile
钯 (II) 催化分子内 1,2-加成到被内部亲核试剂取代的丙二烯。羧酸、醇、N-取代酰胺和氨基甲酸酯用作钯催化反应中的内部亲核试剂,以良好的分离产率提供内酯、四氢吡喃、四氢呋喃、吡咯烷和恶唑烷酮。该反应在 LiBr 存在下以 Pd(OAc)2 作为催化剂进行。使用了两种不同的再氧化剂,对苯醌或 Cu(OAc)2,氧化剂的选择取决于底物。该反应通过对(π-丙二烯)钯络合物的外部亲核攻击(Br-)进行,以产生(π-烯丙基)钯中间体。随后第二个内部亲核试剂的分子内攻击产生产物。中间体(π-烯丙基)钯配合物被分离和表征。研究了反应的范围和局限性及其机理和选择性,在不同的反应...