Palladium-Catalyzed Sequential Alkylation−Alkenylation Reactions and Their Application to the Synthesis of Fused Aromatic Rings
摘要:
The synthesis of fused aromatic carbocycles from aryl iodides and difunctional acceptors is outlined. This methodology is based on a palladium-catalyzed aromatic substitution followed by an intramolecular Heck sequence. Under the optimized conditions (Pd(OAc)(2) (10 mol %), tri-2-furylphosphine (20-30 mol %), norbornene (2 equiv), Cs2CO3 (2 equiv), CH3CN, reflux), bromo-enoates react with aryl iodides bearing numerous substituents (F, Cl, CF3, Me, etc.). The expanded description of our initial work as well as the use of polysubstituted aryl iodides is described.
Direct, One-Step Synthesis of Condensed Heterocycles: A Palladium-Catalyzed Coupling Approach
作者:Farnaz Jafarpour、Mark Lautens
DOI:10.1021/ol061404k
日期:2006.8.1
[reaction: see text] A palladium-catalyzed one-stepsynthesis of fused aromatic heterocycles from bifunctional bromoenoates or bromoalkyl indoles and iodoarenes is reported. This method provides an efficient route to a wide variety of substituted polycyclic aromatic and heteroaromatic compounds from readily accessible starting materials.
The synthesis of fused aromatic carbocycles from aryl iodides and difunctional acceptors is outlined. This methodology is based on a palladium-catalyzed aromatic substitution followed by an intramolecular Heck sequence. Under the optimized conditions (Pd(OAc)(2) (10 mol %), tri-2-furylphosphine (20-30 mol %), norbornene (2 equiv), Cs2CO3 (2 equiv), CH3CN, reflux), bromo-enoates react with aryl iodides bearing numerous substituents (F, Cl, CF3, Me, etc.). The expanded description of our initial work as well as the use of polysubstituted aryl iodides is described.