Direct CHamidation of arylphosphoryl compounds has been developed by using an IrIII catalyst system under mild conditions. A wide range of substrates could be employed with high functional‐group tolerance. This procedure was successfully applied for the first time to the asymmetric reaction giving rise to a P‐chirogenic center with a high diastereomeric ratio of up to 19:1 (90 % de).
Air-stable phosphine organocatalysts for the hydroarsination reaction
作者:Wee Shan Tay、Yongxin Li、Xiang-Yuan Yang、Sumod A. Pullarkat、Pak-Hing Leung
DOI:10.1016/j.jorganchem.2020.121216
日期:2020.5
triarylphosphines are explored as organocatalysts for the hydroarsination reaction. When compared to transition metal catalysis, phosphine organocatalysis greatly improved solvent compatibility of the hydroarsination of nitrostyrenes. Upon complete conversion, arsine products were isolated in up to 99% yield while up to 48% of the phosphine catalyst was still active. A mechanism was proposed and structure-activity
A novel and efficient oxidation of phosphorus(III) compounds with Selectfluor is described. The reactions smoothly led to the formation of tertiary phosphine oxides, phosphinates, and phosphonates in up to 99% yield under mild conditions in minutes.
We report herein a visiblelight-induced oxidation of triarylphosphines under aerobic condition with excellent functional group tolerance. In this transformation, the photo catalyst 4-phenylthioxanthone acted as a photosensitizer for the in situ generation of singlet oxygen. This new approach provided a cheaper and greener method for the preparation of phosphine oxide, showing great advantages in environmental
In the presence of a catalytic amount of the nickel(0) complex derived from Ni(acac)2 or NiCl2 with DIBAL or BuLi, nitrous oxide (N2O) was captured and activated to oxidize phosphine(III) into the corresponding phosphine oxide. Bidentate phosphines, for example, 1,3-bis(diphenylphosphino)propane (dppp), were employed as effective ligands for N2O oxidation and were recovered after the reaction.