A General Palladium-Phosphine Complex To Explore Aryl Tosylates in the N-Arylation of Amines: Scope and Limitations
作者:Pui Ying Choy、Kin Ho Chung、Qingjing Yang、Chau Ming So、Raymond Wai-Yin Sun、Fuk Yee Kwong
DOI:10.1002/asia.201800575
日期:2018.9.4
heterocycles such as indole, carbazole, pyrrole, 10‐phenothiazine, and 10‐phenoxazine were shown to be feasible coupling partners under this catalytic system. The described reaction conditions tolerate a wide range of functional groups and allow an array of aromatic amines as well as unsymmetrical amine products to be easily accessed from the various phenolic derivatives. Interestingly, this catalyst
Small Phosphine Ligands Enable Selective Oxidative Addition of Ar–O over Ar–Cl Bonds at Nickel(0)
作者:Emily D. Entz、John E. A. Russell、Leidy V. Hooker、Sharon R. Neufeldt
DOI:10.1021/jacs.0c06995
日期:2020.9.9
aryl chlorides. This is because Ni(0) and Pd(0) often undergo oxidativeaddition of organohalides at a similar or faster rate than most Ar-O bonds. DFT and stoichiometric oxidativeaddition studies demonstrate that small phosphines, in particular PMe3, are unique in promoting preferential reaction of Ni(0) with aryl tosylates and other C-O bonds in the presence of aryl chlorides. This selectivity was
非三氟甲磺酸酯苯酚衍生物的 Suzuki-Miyaura 偶联的当前方法受限于它们对卤化物(包括芳基氯)的不耐受性。这是因为 Ni(0) 和 Pd(0) 通常以与大多数 Ar-O 键相似或更快的速率进行有机卤化物的氧化加成。DFT 和化学计量氧化加成研究表明,小膦,特别是 PMe3,在促进 Ni(0) 与芳基甲苯磺酸酯和其他 CO 键在芳基氯化物存在下的优先反应方面是独一无二的。这种选择性在第一个 Ni 催化的 CO 选择性 Suzuki-Miyaura 偶联氯化苯酚衍生物中得到了利用,其中含氧离去基团不是氟化磺酸盐,例如三氟甲磺酸盐。计算研究表明,PMe3 和其他膦之间发散选择性的起源不同于配体控制的化学发散交叉偶联的先前例子。由于电子和空间因素,PMe3 影响甲苯磺酸盐的选择性反应。在氧化加成过程中镍和甲苯磺酸的磺酰氧之间的密切相互作用对观察到的选择性至关重要。
Carbon–Boron Bond Cross-Coupling Reaction Catalyzed by −PPh<sub>2</sub> Containing Palladium–Indolylphosphine Complexes
作者:Wing Kin Chow、On Ying Yuen、Chau Ming So、Wing Tak Wong、Fuk Yee Kwong
DOI:10.1021/jo202472k
日期:2012.4.6
compatible, and the catalyst loading down to 0.025 mol % of Pd can be achieved. The Pd/PPh2-Andole-phos system is able to catalyze both borylationreaction and Suzuki–Miyaura coupling reaction in a one-pot sequential manner for the direct synthesis of biaryl compounds in excellent yields.
A new mode of S–O bond activation has been discovered, which constitutes novel reactivity of easily available and bench-stable arylsulfonate phenol esters. This protocol enables access to putative sulfonyl radical intermediates, which enable straightforward access to valuable vinyl sulfones.
New Preparative Method of Aryl Tosylates by Using Organobismuth Reagents
作者:Naoto Sakurai、Teruaki Mukaiyama
DOI:10.1246/cl.2007.928
日期:2007.7.5
A newmethod for the preparation of aryl tosylates by using pentavalent bismuth is described. Treatment of 10-aryl-phenothiabismine 5,5-dioxides, m-chloroperoxybenzoic acid (MCPBA) and p-toluenesulfonic acid monohydrate in dichloromethane affords aryl tosylates in good to high yields.