Cobalt‐Catalyzed Cross‐Coupling of Functionalized Alkylzinc Reagents with (Hetero)Aryl Halides
作者:Ferdinand H. Lutter、Lucie Grokenberger、Philipp Spieß、Jeffrey M. Hammann、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1002/anie.201914490
日期:2020.3.27
A combination of 10 % CoCl2 and 20 % 2,2'-bipyridine ligands enables cross-coupling of functionalized primary and secondary alkylzinc reagents with various (hetero)arylhalides. Couplings with 1,3- and 1,4-substituted cycloalkylzinc reagents proceeded diastereoselectively leading to functionalized heterocycles with high diastereoselectivities of up to 98:2. Furthermore, alkynyl bromides react with
Mild Cobalt-Catalyzed Negishi Cross-Couplings of (Hetero)arylzinc Reagents with (Hetero)aryl Halides
作者:Diana Haas、Jeffrey M. Hammann、Ferdinand H. Lutter、Paul Knochel
DOI:10.1002/anie.201510665
日期:2016.3.7
CoCl2⋅2 LiCl (5 mol %) and HCO2Na (50 mol %) enables the cross‐coupling of various N‐heterocyclic chlorides and bromides as well as aromatic halogenated ketones with various electron‐rich and ‐poor arylzincreagents. The reactions reached full conversion within a few hours at 25 °C.
Multiple Regio- and Chemoselective Functionalizations of Pyrimidine Derivatives Using TMPMgCl×LiCl and TMP<sub>2</sub>Mg×2 LiCl
作者:Paul Knochel、Marc Mosrin、Marilena Petrera
DOI:10.1055/s-0028-1083208
日期:2008.11
The multiple successive regio- and chemoselective magnesiation of commercially available 2-bromopyrimidine at the C4, C6, and C5 positions allows the regioselective functionalization of all positions of the pyrimidine ring.