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
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.
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.
cyclization phosphorylation of isocyanides and Csp2−H phosphorylation. Under visible-light irradiation, a series of phosphorus-substituted phenanthridines, benzothiazoles, isoquinolines, and common heteroaromatics were obtained in good to excellent yields without any aid of electrolysis, metal reductants, or oxidants, and with only H2 or CH4 as byproduct.