Synthesis of zwitterionic palladium complexes and their application as catalysts in cross-coupling reactions of aryl, heteroaryl and benzyl bromides with organoboron reagents in neat water
作者:V. Ramakrishna、N. Dastagiri Reddy
DOI:10.1039/c7dt01433c
日期:——
found to be highly active for carrying out these reactions between aryl bromides and organoboron reagents. Further, the scope of the catalyst I was also examined by employing (hetero)aryl bromides, hydrophilic aryl bromides, benzylbromides and various organoboron reagents. More than 80 aryl/benzyl bromide-arylboronic acid combinations were screened in neat water/K2CO3 and found that I is a versatile catalyst
N-(3-氯-2-喹喔啉基)-N'-芳基咪唑鎓盐(芳基= 2,6-二异丙基苯基[HL1Cl] Cl,芳基=甲苯基[HL2Cl] Cl)已通过将2,3-二氯喹喔啉与N'-芳基咪唑纯净。这些咪唑鎓盐与Pd(PPh 3)4和Pd 2(dba)3 / PPh 3(dba =二苄基苯丙酮)在50 o C的容易反应,得到两性离子钯(II)络合物[Pd(HL1)(PPh 3) Cl 2 ](I)和[Pd(HL2)(PPh 3)Cl 2 ](II)的收率极高。已测试I和II在纯水/ K中催化Suzuki-Miyaura交叉偶联(SMC)反应的能力2 CO 3,对在芳基溴化物和有机硼试剂之间进行这些反应具有很高的活性。此外,还通过使用(杂)芳基溴化物,亲水性芳基溴化物,苄基溴化物和各种有机硼试剂来检查催化剂I的范围。在纯水/ K 2 CO 3中筛选了80多种芳基/苄基溴-芳基硼酸组合,发现I是一种多用途催化