Borylation of organo halides and triflates using tetrakis(dimethylamino)diboron
作者:Charles S. Bello、Joachim Schmidt-Leithoff
DOI:10.1016/j.tetlet.2012.09.009
日期:2012.11
We report a new in situ borylation method using tetrakis(dimethylamino)diboron, DMA4B2, in the presence of a diol. Our method uses standard borylation conditions and readily available Pd-catalysts. The scope of this method includes aryl halides and triflates as well as vinyl halides and triflates. The method successfully works with a broad range of diols, enabling the selection of the best boronic
我们报告了一种新的原位硼化方法,使用四(二甲基氨基)二硼,DMA 4 B 2,在二醇的存在下。我们的方法使用标准的硼化条件和现成的Pd催化剂。该方法的范围包括芳基卤化物和三氟甲磺酸酯以及乙烯基卤化物和三氟甲磺酸酯。该方法成功地与多种二醇一起使用,从而能够为随后的Suzuki偶联选择最佳的硼酸酯。
Efficient Borylation of Reactive Aryl Halides with MPBH (4,4,6-Trimethyl-1,3,2-dioxaborinane)
The combination of 4,4,6-trimethyl-1,3,2-dioxaborinane, a particularly stable and inexpensive borylation reagent, and Buchwald's palladium catalyst provides a simple, fast, cost-effective borylation of electron-rich, reactive iodides, bromides, and triflates to produce stable, easily purified boronic esters.
Synthesis of α‐Quaternary β‐Lactams via Copper‐Catalyzed Enantioconvergent Radical C(sp
<sup>3</sup>
)−C(sp
<sup>2</sup>
) Cross‐Coupling with Organoboronate Esters
作者:Fu‐Li Wang、Lin Liu、Chang‐Jiang Yang、Cheng Luan、Jing Yang、Ji‐Jun Chen、Qiang‐Shuai Gu、Zhong‐Liang Li、Xin‐Yuan Liu
DOI:10.1002/anie.202214709
日期:2023.1.9
Copper-catalyzed enantioconvergent radical C(sp3)−C(sp2) cross-coupling of tertiary alkyl bromides with organoboronate esters is developed to access synthetically valuable α-quaternary chiral β-lactams. The success of this work relies on the utilization of chiral N,N,N-ligands to forge the sterically congested C(sp3)−C(sp2) bonds.
The nickel-catalyzed borylation of aryl iodides and bromides with 4,4,6-trimethyl-1,3,2-dioxaborinane was achieved. The mild reaction conditions employed allowed for the inclusion of common functional groups in aryl halides to be tolerated. A DFT study on the catalytic cycle shows that C-B bond formation occurs through sigma-bond metathesis between dialkoxyborane and arylnickel(II) halide intermediates.