to form thiazol-2-yl-triphenylphosphonium salts, and these phosphoniumsalts react with a wide range of O- and N-centered nucleophiles to give the corresponding ethers, amines, and C-N biaryls. The reactions proceed under mild conditions and allow for the recovery of triphenylphosphine at the end of the sequence. In the presence of hydroxide, phosphoniumsalts undergo disproportionation, resulting in
苯并噻唑与三苯基膦进行区域选择性 C2-H 官能化形成噻唑-2-基-三苯基鏻盐,这些鏻盐与多种 O 和 N 中心亲核试剂反应生成相应的醚、胺和 CN 联芳基。反应在温和条件下进行,并允许在序列末端回收三苯膦。在氢氧化物存在下,鏻盐发生歧化反应,导致苯并噻唑还原,这可用于苯并噻唑的特定 C2 氘化。
Manganese‐Mediated Reductive Alkylation of Thiazolyl‐Phosphonium Salts
作者:Mengwan Yang、Jiaxi Fang、Huan Liu、Xinyao Lu、Jiawen Zhou、Zehuai Mou、Huifei Wang
DOI:10.1002/adsc.202300159
日期:2023.6.13
Reductive functionalization reactions between two electrophiles is a straightforward protocol to access carbon-carbon bonds without use of organometallic reagents prepared in advance. Here, we developed a manganese-mediated reductivealkylation of heterocyclic thiazolyl-phosphonium salts with benzyl bromides to form C2-alkylated benzothiazoles. The reaction features a broad substrate scope, high-functional-group
Transition‐Metal‐Free Alkylation of N‐Heterocycles with Nitriles via Heteroarylphosphonium Intermediates
作者:Fritz Schömberg、Milica Perić、Ivan Vilotijevic
DOI:10.1002/ejoc.202301233
日期:2024.3.18
Benzothiazol-2-yl-phosphonium and pyridin-4-yl-phosphonium salts react with nitrile anions via a proposed nucleophilic aromatic substitution pathway which together with the direct synthesis of phosphonium salts from benzothiazoles and pyridines constitutes an efficient and simple two-step protocol for C−H functionalization of these heterocycles.