Two efficient procedures involving tin hydride or thiophenol-mediated intramolecular homolytic substitution at the sulfur atom are reported. They lead to the generation of varied P(V)-centered radicals from the corresponding aryl or alkyne thiophosphorus substrates. The radical formed can be trapped by an olefin via an intermolecular addition, leading to the construction of C–P bonds. Thiophosphination
Reactions of O,O'-dialkylthiophosphoric acids with acrylates provide a direct synthetic route to beta-carboxylated thiolophosphates. This Michael addition, without solvent, is quantitative at 90degreesC in 1 h for the 2/1 thiophosphoric acid/acrylate ratio. Moreover, this excess of thiophosphoric acid can be reused for further reactions. (C) 2003 Elsevier Ltd. All rights reserved.
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A Robust Methodology for the Synthesis of Phosphorothioates, Phosphinothioates and Phosphonothioates
作者:David J. Jones、Eileen M. O'Leary、Timothy P. O'Sullivan
DOI:10.1002/adsc.202000059
日期:2020.4.27
A robust methodology for the synthesis of phosphorothioates, phosphinothioates and phosphonothioates, including those bearing low molecular weight S‐alkyl side‐chains, is presented. Application of the “caesium effect” in conjunction with the disulfide 3,3’‐dithiobis(propionitrile), which acts as a shelf‐stable sulfur source, avoids recourse to malodorous alkanethiols and toxic P−Cl precursors. A diverse