Zirconium-Mediated Cross-Coupling of Terminal Alkynes and Vinyl Bromides: Selective Synthesis of Cyclobutene and 1,3-Diene Derivatives
作者:José Barluenga、Félix Rodríguez、Lucía Álvarez-Rodrigo、Francisco J. Fañanás
DOI:10.1002/chem.200305337
日期:2004.1.5
diastereoselective synthesis of 1,3-butadiene or cyclobutene derivatives by a zirconium-mediated reaction of alkenyllithium compounds and vinylbromides is reported. The key steps involve the generation of zirconocene-alkyne complexes from haloalkenes and subsequent coupling with alkenyl bromides. Thus, formally the process supposes the cross-coupling reaction between a terminalalkyne and an alkenyl bromide. Moreover
The synthesis of a set of cobalt(III)-complexes equipped with trisubstituted chiral cyclopentadienyl ligands is reported, and their steric and electronic parameters are mapped. The application potential of these complexes for asymmetric C-H functionalizations with 3d-metals is shown by the synthesis of dihydroisoquinolones from N-chlorobenzamides with a broad range of alkenes. The transformation proceeds
报道了一组配备三取代手性环戊二烯基配体的钴 (III) 配合物的合成,并绘制了它们的空间和电子参数。这些配合物在具有 3d 金属的不对称 CH 官能化方面的应用潜力通过从具有广泛烯烃的 N-氯苯甲酰胺合成二氢异喹诺酮类药物来展示。转化过程具有高达 99.5:0.5 er 的出色对映选择性和高区域选择性。对于这种反应类型,观察到的值优于基于铑 (III) 的最佳方法。此外,具有挑战性的底物(如烷基烯烃)也会与高区域选择性和对映选择性反应。
Enantioselective Palladium‐Catalyzed Directed Migratory Allylation of Remote Dienes
作者:Xian‐Xiao Chen、Hao Luo、Ye‐Wei Chen、Yang Liu、Zhi‐Tao He
DOI:10.1002/anie.202307628
日期:2023.8.21
The enantioselective migratory allylation of remote dienes via palladium-catalyzed simultaneous/directed chain walking is reported. The transformation provides a potential route to achieving stereoselective functionalization of multiple continuous C(sp3)−H bonds.