通过等温滴定量热法(ITC)系统地研究了络合在β-环糊精中的叔丁基苯的阳离子,阴离子和中性对位取代衍生物的包合物。所有包含化合物均显示1:1的化学计量比,结合常数范围为10到3 x 10(6)M(-1)。结合自由能可细分为非极性和静电贡献。静电相互作用可以根据库仑定律通过考虑主体和客体的质子化程度,主体内客体的方向以及Debye-Huckel-Onsager理论描述的离子屏蔽来定量描述。客体在环糊精腔内的取向通过ROESY NMR光谱法确定。
A palladium-catalyzeddesulfitative cyanation of arenesulfonylchlorides and sodium sulfinates has been developed, providing aryl nitriles in moderate to excellent yields. It represents a facile procedure to access aryl nitriles.
Atroposelective Construction of Axially Chiral<scp>Alkene‐Indole</scp>Scaffolds<i>via</i>Catalytic Enantioselective Addition Reaction of<scp>3‐Alkynyl</scp>‐2‐indolylmethanols<sup>†</sup>
作者:Jing‐Yi Wang、Meng Sun、Xian‐Yang Yu、Yu‐Chen Zhang、Wei Tan、Feng Shi
DOI:10.1002/cjoc.202100214
日期:2021.8
for this addition reaction. By this strategy, a new class of axially chiral acyclic alkene-indoles was synthesized in overall high yields (up to 86%), excellent (E/Z)-selectivity (all > 95 : 5) and good enantioselectivities (up to 92 : 8 er). This reaction represents the first catalytic enantioselectiveconstruction of axially chiral alkene-indole frameworks, which will add a new member to the family
modular and regioselective approach proceeded via an unprecedented sequence of successive defluorination, dual sulfonylation, and annulation relay, along with four C(sp3)–F bonds cleaved and two new C–S bonds formed. In addition, this transition metal-free C–F bond functionalization which is amenable to gram-scale synthesis occurred under mild reaction conditions and has broad substrate scope and excellent
利用一锅多步多级联反应的合成策略特别受关注。在此,已经开发了一种有效的多氟烷基过氧化物与亚磺酸盐的三组分串联反应,用于容易地构建氟代烷基化的四取代呋喃衍生物。发现DABCO和Cs 2 CO 3的组合对于反应成功是必不可少的。这种模块化和区域选择性的方法是通过空前的依次进行连续除氟,双重磺酰化和环化反应以及四个C(sp 3)–F键断裂,形成了两个新的C–S键。另外,这种适合克级合成的无过渡金属的C-F键官能化反应在温和的反应条件下发生,具有广泛的底物范围和出色的官能团耐受性。此外,该脱氟方案还使复杂化合物的后期功能化成为可能,从而有可能在药物开发中找到合成用途。
Copper(I)-Catalyzed Desulfinative Carboxylation of Sodium Sulfinates using Carbon Dioxide
作者:Song Sun、Jin-Tao Yu、Yan Jiang、Jiang Cheng
DOI:10.1002/adsc.201500101
日期:2015.6.15
A copper(I)‐catalyzed desulfinativecarboxylation of sodiumsulfinatesusingcarbondioxide has been developed. This reaction showed wide functional group tolerance. A series of sodium aryl‐ and alkenylsulfinates could be converted into the corresponding carboxylic acids in good to excellent yields. Additionally, the reaction mechanism was studied by in situ NMR analysis and isotopic labeling experiments
A Synthetic Route to Alkyl−Pt<sup>III</sup> Dinuclear Complexes from Olefins and Its Implication on the Olefin Oxidation Catalyzed by Amidate-Bridged Pt<sup>III</sup> Dinuclear Complexes
ligand) catalyze oxidation of olefins in acidic aqueous solution. Linear olefins are oxidized to ketones, whereas cyclicolefins are oxidized to epoxides. GC−MS analysis of the oxidation products obtained from the reaction in H218O showed that the oxygen atoms in the products are exclusively from water, suggesting that the reaction mechanism is basically similar to that of the Wacker reaction. In accordance