to access the isoquinolone motif via cross-coupling/cyclization of benzhydroxamic acid with alkynes is described. The reaction features a regioselective cleavage of a C-H bond on the benzhydroxamic acid coupling partner as well as a regioselective alkyne insertion. Mechanistic studies point out the important involvement of a N-Obond as a tool for C-Nbondformation and catalystturnover.
描述了通过苯异羟肟酸与炔烃的交叉偶联/环化获得异喹诺酮基序的无外部氧化剂过程。该反应的特点是区域选择性裂解苯异羟肟酸偶联物上的 CH 键以及区域选择性炔烃插入。机理研究指出 NO 键作为 CN 键形成和催化剂周转的工具的重要参与。
Rhodium-catalyzed formal [4 + 3] annulation reaction of N-methoxybenzamides with gem‑difluorocyclopropenes: A combination of experimental and theoretical studies
作者:Yimiao He、Limei Tian、Xuexue Chang、Zeming Qu、Yanmin Huang、Chusheng Huang、Qing Sun、Honggen Wang
DOI:10.1016/j.cclet.2022.01.068
日期:2022.6
A rhodium-catalyzed [4 + 3] cycloaddition reaction between N-methoxybenzamides and gem‑difluorocyclopropenes is described. The reaction offers a mild and efficient approach towards the synthesis of fluorinated 2H-azepin-2-ones with broad substrate scope. A consecutive HOAc-assisted CN bond formation and fluorine elimination are involved as key steps for success as illustrated by detailed DFT studies
描述了N-甲氧基苯甲酰胺和偕二氟环丙烯之间的铑催化 [4 + 3] 环加成反应。该反应为合成具有广泛底物范围的氟化 2 H -azepin-2-ones提供了一种温和有效的方法。如详细的 DFT 研究所示,连续的 HOAc 辅助 C N 键形成和氟消除是成功的关键步骤。
A practical one-pot procedure for the synthesis of N–H isoquinolones
A practical one-pot procedure for the preparation of N-H isoquinolones has been developed. This 2-step process via C-H activation of N-alkoxyl benzamides and NaH-mediated dealkoxylation reaction has been demonstrated to be a high yielding alternative methodology for the efficient synthesis of a wide range of representative N-H isoquiolones. In addition, the experimental precedent supported mechanism of the dealkoxylation reaction was also proposed. (C) 2013 Elsevier Ltd. All rights reserved.