在Ni-Na中首次比较了甲磺酸盐,氨基磺酸盐,酯,碳酸盐,氨基甲酸酯和甲基醚作为基于C-O的亲电子试剂的效率,这些亲电试剂连接到萘的1或2位以及活化和非活化的苯基底物上。催化与在对位含有富电子和缺电子取代基的新戊基硼硼酸苯基酯的交叉偶联。这些实验是在四种不同的基于Ni(II)和Ni(0)的催化剂的存在下进行的。基于Ni(II)的催化剂在K 3 PO 4介导大多数2-萘基C–O亲电试剂与芳基硼酸和新戊二醇硼酸酯的交叉偶联用作基础。当CsF用作碱时,相同的催化剂效率不高。然而,基于Ni(0)的催化剂表现出选择性效率,并且当具有反应性时,它们的效率高于同时存在K 3 PO 4和CsF的Ni(II)基催化剂的效率。这些结果既为交叉偶联提供了反应条件,又为各种基于C-O的亲电试剂与芳基新戊二醇硼酸酯的正交交叉偶联方法的完善提供了条件。除甲磺酸酯和氨基磺酸酯外,与芳基新戊基乙二醇硼酸酯交叉偶联时,所有
Ni‐catalyzed decarboxylative cross‐coupling of potassium polyfluorobenzoates with unactivated phenol and phenylmethanol derivatives is described. This novel transformation provides a practical and efficient protocol towards the synthesis of important polyfluorobiaryls and polyfluorinated diarylmethanes, and greatly enlarges the range of electrophiles utilized in decarboxylative coupling. Remarkably, preliminary
A nickel-catalyzed protocol for the conversion of aryl and heteroaryl alcohol derivatives to primary and secondary aromaticamines via C(sp2)–O bond cleavage is described. The new amination protocol can be applied to a range of substrates bearing diverse functional groups and uses readily available benzophenone imines as an effective nitrogen source.
An Efficient Suzuki-Miyaura Coupling of Aryl Sulfamates and Boronic Acids Catalyzed by NiCl2(dppp)
作者:Guo-Jun Chen、Fu-She Han
DOI:10.1002/ejoc.201200444
日期:2012.7
The SuzukiMiyaura cross-coupling of aryl sulfamates and boronicacids was investigated by using [1,3-bis(diphenylphosphanyl)propane]nickel(II) chloride NiCl2(dppp)} as the catalyst. The results showed that NiCl2(dppp) is a highly active and general catalyst that allows effective SuzukiMiyaura cross-coupling of aryl sulfamates with a slight excess amount of the boronicacid (1.2 equiv.) in the presence
Pincer-Nickel-Catalyzed Cross-Coupling of Aryl Sulfamates with Arylzinc Chlorides
作者:Jian-Long Tao、Zhong-Xia Wang
DOI:10.1002/ejoc.201500987
日期:2015.9
The nickel N,N,N-pincer complex 2 was demonstrated to effectively catalyze the cross-coupling of arylsulfamates with arylzincchlorides under mild conditions. The reaction is suitable for a wide range of substrates, and tolerates various functional groups.
Nickel-Catalyzed Stille Cross Coupling of C–O Electrophiles
作者:John E. A. Russell、Emily D. Entz、Ian M. Joyce、Sharon R. Neufeldt
DOI:10.1021/acscatal.9b00744
日期:2019.4.5
Aryl sulfamates, tosylates, and mesylates undergo efficient Ni-catalyzed crosscoupling with diverse organostannanes in the presence of relatively unhindered alkylphosphine ligands and KF. The coupling is valuable for difficult bond constructions, such as aryl—heteroaryl, aryl—alkenyl, and aryl—alkynyl, using nontriflate phenol derivatives. A combination of experimental and computational studies implicates
在相对不受阻碍的烷基膦配体和 KF 存在下,芳基氨基磺酸盐、甲苯磺酸盐和甲磺酸盐可与多种有机锡烷进行有效的 Ni 催化交叉偶联。该偶联对于使用非三氟甲磺酸酯苯酚衍生物的困难的键构建很有价值,例如芳基-杂芳基、芳基-烯基和芳基-炔基。实验和计算研究的结合揭示了涉及 8 中心循环过渡态的不寻常的金属转移机制。由于 Ni(II)-氯化物中间体上有机锡烷的缓慢金属转移,该反应受到氯化物源的抑制。这些研究有助于解释为什么之前实现苯酚衍生物的 Ni 催化 Stille 偶联的努力不成功。