Ni-catalyzed construction of C–P bonds from electron-deficient phenols via the in situ aryl C–O activation by PyBroP
作者:Yu-Long Zhao、Guo-Jie Wu、Fu-She Han
DOI:10.1039/c2cc31718d
日期:——
The CâP bond forming reaction using electron-deficient phenol substrates was considerably challenging. Herein, we present a new protocol that allows for one-pot construction of CâP bonds via the cross-coupling of phenols and phosphine oxide or phosphite in the presence of a nickel catalyst.
Visible-light-induced tandem radical addition–cyclization of 2-aryl phenyl isocyanides catalysed by recyclable covalent organic frameworks
作者:Shuyang Liu、Wenna Pan、Songxiao Wu、Xiubin Bu、Shigang Xin、Jipan Yu、Hao Xu、Xiaobo Yang
DOI:10.1039/c9gc00022d
日期:——
A visible-light-induced tandemradicaladdition–cyclization sequence via 2-aryl phenyl isocyanides as the starting material and two-dimensional covalent organic frameworks (2D-COFs) as the photocatalyst was developed, delivering multifarious 6-substituted phenanthridines in high yields. Benefitting from the utilization of a heterogeneous photocatalyst, this protocol features easy catalyst separation
Selective P−C(sp<sup>3</sup>
) Bond Cleavage and Radical Alkynylation of α-Phosphorus Alcohols by Photoredox Catalysis
作者:Kunfang Jia、Junzhao Li、Yiyun Chen
DOI:10.1002/chem.201800202
日期:2018.3.2
cleavage and radical alkynylation of α‐phosphorus alcohols to construct phosphonoalkynes is reported. The phosphorus radical is generated upon P−C bond cleavage reaction via the alkoxyl radical through photoredox catalysis with cyclic iodine(III) reagents. Various arylphosphinoyl‐, alkylphosphinoyl‐, phosphonate‐, and phosphonic amide alcohols serve as radical phosphorus precursors to construct phosphonoalkynes
the generation of phosphinoyl radicals from the combination of diphenyliodonium salt (Ph2I+,–OTf) with triethylamine (Et3N) in the presence of secondary phosphine oxides is reported. By employing this practical and simple approach, a large variety of 6-phosphorylated phenanthridines have been synthesized through the addition of phosphinoyl radicals to isonitriles as radical acceptors. The reaction works
报道了在仲氧化膦的存在下,由二苯基碘鎓盐(Ph 2 I +,– OTf)与三乙胺(Et 3 N)结合生成膦酰基的新颖有效方法。通过采用这种实用且简单的方法,已经通过向膦腈中添加膦酰基作为自由基受体而合成了多种6-磷酸化的菲啶。在没有任何过渡金属或光催化剂的情况下,该反应可顺利进行。在电子顺磁共振(EPR)和密度泛函理论(DFT)计算的基础上,讨论了该反应的机理。
Synthesis of phenanthridin-6-yldiphenylphosphine oxides by oxidative cyclization of 2-isocyanobiphenyls with diarylphosphine oxides
作者:Yuewen Li、Guanyinsheng Qiu、Qiuping Ding、Jie Wu
DOI:10.1016/j.tet.2014.05.039
日期:2014.8
A Mn(III)-promoted oxidative cyclization of 2-isocyanobiphenyls with diarylphosphineoxides is reported, providing phenanthridin-6-yldiphenylphosphine oxides in good yields. Radical phosphonation and isocyanide insertion are believed to be involved in the reaction process.