Suzuki−Miyaura Coupling of Aryl Tosylates Catalyzed by an Array of Indolyl Phosphine−Palladium Catalysts
摘要:
A family of indolyl phosphine ligands was applied to Suzuki-Miyaura cross-coupling of aryl tosylates. Catalyst loading can be reduced to 0.2 mol % for coupling of nonactivated aryl tosylate. A challenging example for room temperature coupling is realized. The scope of this highly active Pd/L2 system can be extended to other boron nucleophiles, including trifluoroborate salts and boronate esters. The ligand structural comparisons toward the reactivity in tosylate couplings are also described.
咪唑并[1,2- a ]吡啶类的区域选择性直接C-3芳基化与芳基甲苯磺酸盐和甲磺酸盐由钯-膦配合物促进
摘要:
咪唑并直接C-3的芳基化[1,2一]吡啶与芳基甲苯磺酸酯和甲磺酸酯已通过采用钯完成(II)与SPhos(2-二环己基膦基-2',6'-二甲氧基联苯)或相关联的醋酸L1(2 -(2-(二异丙基膦基)苯基)-1-甲基-1 H-吲哚)。该催化剂体系可用于各种芳基磺酸盐,并显示出优异的咪唑并[1,2- a ]吡啶的C-3区域选择性。这些结果代表了使用甲苯磺酸酯和甲磺酸酯官能化的芳烃作为该区域选择性直接芳基化的亲电子伙伴的第一个例子。