Copper-Catalyzed Reductive Trifluoromethylation of Alkyl Iodides with Togni’s Reagent
作者:Yanchi Chen、Guobin Ma、Hegui Gong
DOI:10.1021/acs.orglett.8b02005
日期:2018.8.3
This work illustrates a reductive cross-electrophile coupling protocol for trifluoromethylation of alkyl iodides under Cu-catalyzed/Ni-promoted reaction conditions. The use of diboron esters as the terminal reductant allows the effective generation of the alkyl–CF3 products with excellent functional group tolerance and broad substrate scope. A mechanism involving a reaction of alkyl–Cu with Togni’s
Silicon–Carbon Bond Formation via Nickel-Catalyzed Cross-Coupling of Silicon Nucleophiles with Unactivated Secondary and Tertiary Alkyl Electrophiles
作者:Crystal K. Chu、Yufan Liang、Gregory C. Fu
DOI:10.1021/jacs.6b03465
日期:2016.5.25
cross-coupling methods for the formation of C-C bonds from unactivated alkyl electrophiles have been described in recent years. In contrast, progress in the development of methods for the construction of C-heteroatom bonds has lagged; for example, there have been no reports of metal-catalyzed cross-couplings of unactivated secondary or tertiaryalkyl halides with silicon nucleophiles to form C-Si bonds. In this
近年来,已经描述了用于从未活化的烷基亲电试剂形成 CC 键的一系列交叉偶联方法。相比之下,C-杂原子键构建方法的开发进展滞后;例如,没有关于未活化的仲或叔烷基卤化物与硅亲核试剂在金属催化下交叉偶联形成 C-Si 键的报道。在这项研究中,我们解决了这一挑战,确定了一种简单的市售镍催化剂(NiBr2·二甘醇二甲醚)可以在异常温和的条件下(例如,-20°C)实现烷基溴与亲核硅试剂的偶联;特别值得注意的是我们能够使用未活化的叔烷基卤化物作为亲电偶联伙伴,这在交叉偶联化学领域还比较少见。立体化学、相对反应性和自由基陷阱研究与 CX 键裂解的均裂途径一致。
Ester Formation via Nickel-Catalyzed Reductive Coupling of Alkyl Halides with Chloroformates
作者:Min Zheng、Weichao Xue、Teng Xue、Hegui Gong
DOI:10.1021/acs.orglett.6b03158
日期:2016.12.2
The synthesis of alkyl esters from readily available alkyl halides and chloroformates was achieved for the first time using a mild Ni-catalyzed reductive coupling protocol. Unactivated primary and secondary alkyl iodides as well as glycosyl, benzyl, and aminomethyl halides were successfully employed to yield products in moderate to excellent yields with high functional group tolerance.
Kosulina, T. P.; Ol'khovskaya, L. I.; Kul'nevich, V. G., Russian Journal of Organic Chemistry, 1995, vol. 31, # 11, p. 1538 - 1541
作者:Kosulina, T. P.、Ol'khovskaya, L. I.、Kul'nevich, V. G.、Karataeva, F. Kh.
DOI:——
日期:——
Palladium-catalyzed intermolecular amination of unactivated C(sp<sup>3</sup>)–H bonds via a cleavable directing group
作者:Lianwen Jin、Xiaoli Zeng、Siyang Li、Xuechuan Hong、Guofu Qiu、Peng Liu
DOI:10.1039/c7cc00808b
日期:——
Cleavable directing group promoted palladium-catalyzed intermolecularamination of unactivatedC(sp3)-Hbonds with NFSI as the amino source was developed.