The Heck coupling reactions of aryl halides and 3,4-dihydro-2H-pyran facilitated the regioselective synthesis of arylated cyclic enol ethers. Good yields were obtained using 5 mol% of an NHC-ligand-Pd-catalyst complex in the presence of K2CO3 in DMF at 100 ËC. The use of this catalytic system broadens the substrate scope and improves the selectivity for this cross-coupling process.
芳基卤化物和3,4-二氢-2H-
呋喃的赫克耦合反应促进了取代芳基环烯醇醚的区域选择性合成。在
DMF中,在100℃下使用5摩尔%的NHC
配体-Pd催化剂复合物,并在K2CO3的存在下可以获得良好的产率。这种催化体系扩大了底物范围,并提高了该交叉耦合过程的选择性。