2,4,5,6-Tetrakis(3,6-di-tert-butyl-9H-carbazol-9-yl)isophthalonitrile (4CzIPN-tBu) was developed as a photocatalyst for the phosphorus-radical-initiated cascade cyclization reaction of isocyanides. By using 4CzIPN-tBu as catalyst, we developed a visible-light-induced proton-coupled electron transfer strategy for the generation of phosphorus-centered radicals, via which a wide range of phosphorylated
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.
Silver-catalyzed 2-isocyanobiaryls insertion/cyclization with phosphine oxides: synthesis of 6-phosphorylated phenanthridines
作者:Jia-Jia Cao、Tong-Hao Zhu、Zheng-Yang Gu、Wen-Juan Hao、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1016/j.tet.2014.07.078
日期:2014.9
silver-catalyzed 2-isocyanobiaryls insertion/cyclization with phosphine oxides was described for the construction of the 6-phosphorylated phenanthridines through radical addition of in situ formed P-centered radical to 2-isocyanobiphenyls and homolytic aromatic substitution process. The reactions could proceed smoothly to give the desired 6-phosphorylated phenanthridines promoted by AgOAc (20 mol %) with PhI(OAc)2
Synthesis of 6-Phosphorylated Phenanthridines by Mn(II)-Promoted Tandem Reactions of 2-Biaryl Isothiocyanates with Phosphine Oxides
作者:Wei-Si Guo、Qian Dou、Jian Hou、Li-Rong Wen、Ming Li
DOI:10.1021/acs.joc.7b00907
日期:2017.7.7
A novel Mn(II)-promoted tandem phosphorylation/cyclization reaction of 2-biaryl isothiocyanates with phosphine oxides is described. This is the first general method to synthesize 6-phosporylated phenanthridines from 2-biaryl isothiocyanates. The approach is featured by oxidant-free, low loading of P-reagent, easy operation, and high functional group tolerance.