We report an unexpected rearrangement of 3-hydroxyoxindoles into benzoxazinones using electrochemistry. Our reaction employs mild and environmentally friendly conditions, and the benzoxazinone products are obtained in moderate to excellent yields. Mechanistic experiments suggest that a peroxide intermediate is likely involved.
Synthesis of Sulfur-Containing Oxindoles by Photoinduced Alkene Difunctionalization via Sulfur 1,2-Relocation
作者:Cong Lu、Rui Chen、Rui Wang、Dong Jing、Ke Zheng
DOI:10.1021/acs.orglett.2c04189
日期:2023.2.10
which have been widely applied in agrochemicals and pharmaceuticals. Herein, a new approach for the efficient construction of sulfur-containing oxindoles by photoinduced alkene difunctionalization via sulfur 1,2-relocation is developed. The method exhibited a high functional group tolerance and broad substrate compatibility. A library of sulfur-containing oxindole derivatives were synthesized under mild
Phosphine-Catalyzed Allylic Alkylation of (Hetero)Aryl Alkynes with Pronucleophiles: Concise Total Synthesis of (±)-Esermethole
作者:Ningtao He、Jilong Zhang、Xiaohe Miao、Dehai Li、De Wang
DOI:10.1021/acs.orglett.3c02275
日期:2023.8.25
Allylic alkylations are valuable in the construction of versatile carbon–carbon bonds, which are mostly catalyzed by noble transition metals with additional waste byproductgeneration. Here, we present the first organophosphine-catalyzed allylic alkylation of (hetero)aryl alkynes with various carbo-nucleophiles. The methodology is highly atom economical and compatible with a wide substrate scope (more
The field of asymmetric catalysis has been developed by exploring noncovalent interactions, particularly within N-heterocyclic carbene-mediated processes. Despite challenges due to the limited number of compatible electrophiles (predominantly π-acceptors), this study introduces the first asymmetric α-alkylation of 3-aryl oxindoles using Csp3 electrophiles. The innovative protocol integrates diverse
不对称催化领域是通过探索非共价相互作用而发展起来的,特别是在 N-杂环卡宾介导的过程中。尽管由于相容亲电子试剂(主要是 π 受体)数量有限而面临挑战,本研究首次使用 C sp3亲电子试剂对 3-芳基羟吲哚进行不对称 α-烷基化。该创新方案集成了多种羟吲哚和烷基、烯丙基和炔丙基亲电子试剂,实现了高产率和对映选择性。初步的机理探索支持非共价催化机制,增强了构建具有潜在应用的复杂手性分子的工具包。
Kohn; Ostersetzer, Monatshefte fur Chemie, 1916, vol. 37, p. 26