Rapid Metal-Free Formation of Free Phosphines from Phosphine Oxides
作者:Cei B. Provis-Evans、Emma A. C. Emanuelsson、Ruth L. Webster
DOI:10.1002/adsc.201800723
日期:2018.10.18
A rapid method for the reduction of secondary phosphineoxides under mild conditions has been developed, allowing simple isolation of the corresponding free phosphines. The methodology involves the use of pinacol borane (HBpin) to effect the reduction while circumventing the formation of a phosphine borane adduct, as is usually the case with various other commonly used borane reducing agents such as
A Superior Method for the Reduction of Secondary Phosphine Oxides
作者:Carl A. Busacca、Jon C. Lorenz、Nelu Grinberg、Nizar Haddad、Matt Hrapchak、Bachir Latli、Heewon Lee、Paul Sabila、Anjan Saha、Max Sarvestani、Sherry Shen、Richard Varsolona、Xudong Wei、Chris H. Senanayake
DOI:10.1021/ol0517832
日期:2005.9.1
to be outstanding reductants for secondaryphosphineoxides (SPOs). All classes of SPOs can be readily reduced, including diaryl, arylalkyl, and dialkyl members. Many SPOs can now be reduced at cryogenic temperatures, and conditions for preservation of reducible functional groups have been found. Even the most electron-rich and sterically hindered phosphineoxides can be reduced in a few hours at 50-70
Facile, Catalytic Dehydrocoupling of Phosphines Using β‐Diketiminate Iron(II) Complexes
作者:Andrew K. King、Antoine Buchard、Mary F. Mahon、Ruth L. Webster
DOI:10.1002/chem.201503399
日期:2015.11.2
Catalytic dehydrocoupling of primary and secondary phosphines has been achieved for the first time using an iron pre‐catalyst. The reaction proceeds under mild reaction conditions and is successful with a range of diarylphosphines. A proton acceptor is not needed for the transformation to take place, but addition of 1‐hexene does allow for turnover at 50 °C. The catalytic system developed also facilitates
Construction of Benzo-1,2,3-thiazaphosphole Heterocycles by Annulations of <i>ortho</i>-Phosphinoarenesulfonyl Fluorides with Trimethylsilyl Azide
作者:Wenjun Luo、Zhenguo Wang、Xiaohui Cao、Dacheng Liang、Mingjie Wei、Keshu Yin、Le Li
DOI:10.1021/acs.joc.0c01309
日期:2020.11.20
Annulations of ortho-phosphinoarenesulfonyl fluorides with trimethylsilylazide were developed to access an unprecedented benzo-1,2,3-thiazaphosphole heterocycle. A corresponding reaction mechanism was proposed and further elucidated by experimental and computational studies. The reaction proceeds through a Staudinger-type iminophosphorane intermediate followed by intramolecular trapping with sulfonyl
Hydrogen/Halogen Exchange of Phosphines for the Rapid Formation of Cyclopolyphosphines
作者:Adam N. Barrett、Callum R. Woof、Christopher A. Goult、Danila Gasperini、Mary F. Mahon、Ruth L. Webster
DOI:10.1021/acs.inorgchem.1c02734
日期:2021.11.1
The hydrogen/halogen exchange of phosphines has been exploited to establish a truly useable substrate scope and straightforward methodology for the formation of cyclopolyphosphines. Starting from a single dichlorophosphine, a sacrificial proton “donor phosphine” makes the rapid, mild synthesis of cyclopolyphosphines possible: reactions are complete within 10 min at room temperature. Novel (aryl)cyclopentaphosphines