Pyridine-catalyzed desulfonative borylation of benzyl sulfones
作者:Yuuki Maekawa、Zachary T. Ariki、Masakazu Nambo、Cathleen M. Crudden
DOI:10.1039/c9ob01099h
日期:——
pyridine-catalyzed desulfonative borylation of benzyl sulfones with bis(pinacolato)diboron (B2pin2). A variety of benzhydryl- and benzyl boronic esters could be synthesized from readily prepared sulfone derivatives. The borylation of cyclic sulfones accompanied by ringopening also proceeded to afford the corresponding sulfonate, which could be converted into functionalized sulfones and sulfonamides.
Second-order rate constants for the reactions of the phenylsulfinate ion PhSO(2)(-) with benzhydrylium ions Ar(2)CH(+) have been determined in DMSO, acetonitrile, and aqueous acetonitrile solution using laser-flash and stopped-flow techniques. The rate constants follow the correlation equation log k (20 degrees C) = s(N + E), which allows the determination of the nucleophile-specific parameters N and s for
Modular Synthesis of Triarylmethanes through Palladium-Catalyzed Sequential Arylation of Methyl Phenyl Sulfone
作者:Masakazu Nambo、Cathleen M. Crudden
DOI:10.1002/anie.201307019
日期:2014.1.13
Triarylmethanes, which are valuable structures in materials, sensing and pharmaceuticals, have been synthesized starting from methylphenylsulfone as an inexpensive and readily available template. The three aryl groups were installed through two sequential palladium‐catalyzed CH arylation reactions, followed by an arylative desulfonation. This method provides a new synthetic approach to multisubstituted
alkylation of sulfinicacids with sulfonamides has been developed via sp3 C−N bond cleavage at room temperature. In the absence of external catalysts and additives, a wide variety of N-benzylic and N-allylic sulfonamides couple with sulfinicacids to give structurally diversified sulfones in moderate to excellent yields. Furthermore, the reaction of N-(2-acyl)allylic sulfonamides with sulfinicacids provides
Photocatalyzed site-selective C(sp3)-H sulfonylation of toluene derivatives and cycloalkanes with inorganic sulfinates
作者:Shaonan Zhang、Shi Cao、Yu-Mei Lin、Liyuan Sha、Cheng Lu、Lei Gong
DOI:10.1016/s1872-2067(21)63953-0
日期:2022.3
The development of practical methods for the direct and selective C(sp3)-H functionalization of hydrocarbons is an attractive topic in synthetic chemistry. Although the radical-mediated hydrogen atom transfer (HAT) process has shown considerable potential in such reactions, it still faces fundamental problems associated with reactivity and selectivity. Herein, we report a convenient and economic approach
开发用于烃的直接和选择性C( sp 3 )-H 官能化的实用方法是合成化学中的一个有吸引力的课题。尽管自由基介导的氢原子转移 (HAT) 过程在此类反应中显示出相当大的潜力,但它仍然面临与反应性和选择性相关的基本问题。在此,我们报告了一种方便且经济的位点选择性 C( sp 3 ) -H 磺酰化方法光诱导的 HAT 催化。使用共轭多环醌作为直接 HAT 光催化剂,市售无机亚磺酸盐作为磺酰化源,三氟甲磺酸铜作为廉价氧化剂,多种甲苯衍生物和环烷烃在温和条件下转化为生物和合成有趣的砜产品。机理研究表明,反应顺序涉及直接 HAT 诱导的自由基形成和随后的铜介导的有机金属过程以形成 CS 键。这种方法提供了一个吸引人的机会,可以从丰富的碳氢化合物起始材料和廉价的试剂中提供高附加值的产品。