Introducing <i>N</i>-Heterocyclic Iminophosphoranes (NHIPs): Synthesis by [3 + 2] Cycloaddition of Azophosphines with Alkynes and Reactivity Studies
作者:Keita Tanaka、Martin-Louis Y. Riu、Brian Valladares、Christopher C. Cummins
DOI:10.1021/acs.inorgchem.2c01844
日期:2022.9.5
phosphinohydrazines (Ar–NH–NH–PR2) by 2,5-dialkyl-1,4-benzoquinones. Azophosphines underwent 1,3-dipolar cycloaddition with cyclooctyne and dimethylacetylene dicarboxylate to give N-heterocyclic iminophosphoranes (NHIPs), which are structurally similar to cyclic (alkyl)(amino)carbenes. The cycloaddition reaction is compatible with various phosphorus atom substituents including phenyl (NHIP-1,4,6), isopropyl
偶氮膦 (Ar-N=N-PR 2 ) 由N-芳基-N '-(三甲基甲硅烷基)二氮烯 (Ar-N=N-SiMe 3 ) 和 R 2 PCl 通过 Me 3 SiCl 消除或氧化膦肼 (Ar –NH–NH–PR 2 ) 由 2,5-二烷基-1,4-苯醌组成。偶氮膦与环辛炔和二甲基乙炔二羧酸酯进行 1,3-偶极环加成反应得到N-杂环亚氨基正膦 (NHIP),其结构类似于环状 (烷基)(氨基) 卡宾。环加成反应与各种磷原子取代基相容,包括苯基(NHIP-1,4,6)、异丙基(NHIP-2)、环己基(NHIP-3 ) 和二甲氨基 ( NHIP-5 ) 基团。乙腈中 NHIP的 p K BH +值范围为 13.13 至 23.14。根据 Huynh 电子参数,NHIP-1和NHIP-2的 σ 供体强度与 1,8-二氮杂双环[5.4.0]undec-7-ene 相当。NHIP-1与五氟吡啶进行了简单的 1