A Study on the Rearrangement of Dialkyl 1-Aryl-1-hydroxymethylphosphonates to Benzyl Phosphates

Author(s): Zita Rádai, Réka Szabó, Áron Szigetvári, Nóra Zsuzsa Kiss, Zoltán Mucsi, György Keglevich*.

Journal Name: Current Organic Chemistry

Volume 24 , Issue 4 , 2020

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The phospha-Brook rearrangement of dialkyl 1-aryl-1-hydroxymethylphosphonates (HPs) to the corresponding benzyl phosphates (BPs) has been elaborated under solid–liquid phase transfer catalytic conditions. The best procedure involved the use of triethylbenzylammonium chloride as the catalyst and Cs2CO3 as the base in acetonitrile as the solvent at room temperature. The substrate dependence of the rearrangement has been studied, and the mechanism of the transformation under discussion was explored by quantum chemical calculations. The key intermediate is an oxaphosphirane. The one-pot version starting with the Pudovik reaction has also been developed. The conditions of this tandem transformation were the same, as those for the one-step HP→BP conversion.

Keywords: α-hydroxyphosphonate, benzyl phosphate, phospha-Brook rearrangement, mechanism.

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Article Details

Year: 2020
Page: [465 - 471]
Pages: 7
DOI: 10.2174/1385272824666200226114306
Price: $95

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