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
Visible-Light-Induced Cascade Reaction of Isocyanides and <i>N</i>-Arylacrylamides with Diphenylphosphine Oxide via Radical C–P and C–C Bond Formation
作者:Chun-Xiao Li、De-Shuang Tu、Rui Yao、Hong Yan、Chang-Sheng Lu
DOI:10.1021/acs.orglett.6b02413
日期:2016.10.7
An effective photoredox-mediated tandem phosphorylation/cyclization reaction of diphenylphosphine oxide with three types of radical acceptors leads to P(O)Ph2-containing phenanthridines, isoquinolines, and indolin-2-ones by formation of both C–P and C–C bonds. [Ir(ppy)2(dtbpy)]PF6 (1 mol %) was used as the catalyst, CsF or Cs2CO3 as the base, and K2S2O8 as the oxidant. A series of functional groups
有效的光氧化还原介导的二苯基氧化膦与三种类型的自由基受体的串联磷酸化/环化反应可通过形成C–P和C–C形成含P(O)Ph 2的菲啶,异喹啉和吲哚-2-酮债券。使用[Ir(ppy)2(dtbpy)] PF 6(1 mol%)作为催化剂,使用CsF或Cs 2 CO 3作为碱,使用K 2 S 2 O 8作为氧化剂。在室温下可以耐受一系列官能团。产生了中等至良好的产量。
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.