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。
Nickel-Catalyzed Cross-Coupling of Ammonia or Primary Alkylamines with (Hetero)aryl Sulfamates, Carbamates, or Pivalates
作者:Mark Stradiotto、Preston MacQueen
DOI:10.1055/s-0036-1590819
日期:2017.8
A catalyst system capable of effecting the cross-coupling of ammonia or primary alkylamines with (hetero)arylsulfamates, carbamates, or pivalates is reported for the first time. The air-stable nickel(II) pre-catalyst C1 tolerates a broad spectrum of heterocyclic functionality within both reaction partners, as well as ether, nitrile, pyrrole, trifluoromethyl, and boronate ester substituents. In the
首次报道了能够实现氨或伯烷基胺与(杂)芳基氨基磺酸酯、氨基甲酸酯或新戊酸酯交叉偶联的催化剂体系。空气稳定的镍 (II) 预催化剂 C1 可耐受两种反应伙伴以及醚、腈、吡咯、三氟甲基和硼酸酯取代基中的广谱杂环官能团。在涉及伯烷基胺和(杂)芳基氨基磺酸酯和氨基甲酸酯的反应的情况下,实现了室温交叉偶联。