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Triphenylphosphine-mediated chemoselective synthesis of functionalized thiazol-2(5H)-ones

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Abstract

Stabilized phosphoranes, obtained from three-component reaction between dialkyl acetylenedicarboxylates and thiazolidine-2,4-dione in the presence of triphenylphosphine, undergo a smooth intramolecular Wittig reaction in boiling toluene to produce functionalized thiazol-2(5H)-ones in good yields. When alkyl propiolates were employed in these reactions, only the (E)-isomer of alkyl 3-(2,4-dioxothiazolidin-3-yl)acrylates were isolated. A dynamic effect was observed in the 1H nuclear magnetic resonance (NMR) spectrum of ethyl (E)-3-(2,4-dioxothiazolidin-3-yl)-3-phenylacrylate as a result of restricted rotation (∆G  = 77 kJ/mol) around the N–C bond between the thiazolidine moiety and the vinyl group.

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Correspondence to Issa Yavari.

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Yavari, I., Azad, L. & Sanaeishoar, T. Triphenylphosphine-mediated chemoselective synthesis of functionalized thiazol-2(5H)-ones. Monatsh Chem 142, 177–182 (2011). https://doi.org/10.1007/s00706-010-0434-x

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  • DOI: https://doi.org/10.1007/s00706-010-0434-x

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