A convenient method has been developed, which allows for the direct transformation of aryl iodides into the corresponding carboxylic acid anhydrides viaPd-catalyzed carbonylation under atmospheric CO pressure.
Nickel-Catalyzed Three-Component Reductive Alkylacylation of Electron-Deficient Activated Alkenes
作者:Lin Wang、Chuan Wang
DOI:10.1021/acs.orglett.0c03210
日期:2020.11.20
alkylacylation of electron-deficient activated alkenes with tertiary alkyl bromides and acid anhydrides. This method enables the efficient preparation of a variety of ketones with broad substrate scope and high functionality tolerance starting from simple precursors. On the basis of the preliminary mechanistic investigations, a catalytic cycle involving the synergistic interaction of nickel, zinc, and MgCl2
scope and excellent functional group tolerance using readily available starting materials and allowing rapid access to structurally complex α-amino ketone derivatives in high enantioselectivity. A suitable chiral biimidazoline ligand together with additional chelation of the amide carbonyl group in a Ni alkyl intermediate facilitates the enantioselective control by suppressing the background reaction
手性α-氨基酮作为功能分子已得到广泛应用。以叔烷基溴和羧酸衍生的亲电子试剂作为偶联剂,实现了镍催化、对映选择性、完全分子间三组分N-酰基烯酰胺的 1,2-烷基酰化。这种还原偶联策略操作简单,使用易于获得的起始材料,表现出广泛的底物范围和优异的官能团耐受性,并允许以高对映选择性快速获得结构复杂的 α-氨基酮衍生物。合适的手性双咪唑啉配体与 Ni 烷基中间体中酰胺羰基的额外螯合有助于通过抑制背景反应来促进对映选择性控制,从而实现优异的对映选择性。机理研究表明自由基物种的中介作用。
P<sup>III</sup>
-Chelation-Assisted Indole C7-Arylation, Olefination, Methylation, and Acylation with Carboxylic Acids/Anhydrides by Rhodium Catalysis
作者:Xiaodong Qiu、Panpan Wang、Dingyi Wang、Minyan Wang、Yu Yuan、Zhuangzhi Shi
DOI:10.1002/anie.201813182
日期:2019.1.28
olefination, and methylation of indoles with carboxylic acids or anhydrides by C−H and C−C bond activation have been developed. Furthermore, C7‐acylation products can also be generated selectively at a lower reaction temperature in the developed system. The key to the high reactivity and regioselectivity of this transformation is the appropriate choice of an indole N‐PtBu2 chelation‐assisted group
Nickel-catalyzed decarbonylation of aryl anhydrides for the synthesis of thioesters and thioethers: CS2/DBU as a surrogate sulfur source
作者:Jia-Xin Li、Rui Tian、Yong-Ming Zhu
DOI:10.1016/j.tet.2023.133814
日期:2024.2
strategy for C–S bond formation is developed. This reaction utilizes a low-cost, air- and moisture-insensitive nickel pre-catalyst to execute a decarbonylative reaction of acid anhydrides, followed by reaction with an odorless and manageable carbon disulfide, to synthesize various thioesters and thioethers. The process accommodated various acid anhydrides and yielded products in good to excellent quantities