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- W2013480765 abstract "An efficient “one-step” synthesis of cyclic amidines and guanidines has been developed. Treatment of cyclic amides and ureas with benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (BOP), base, and nitrogen nucleophiles leads to the formation of the corresponding cyclic amidines and guanidines, typically in good to excellent yields. This method has also been used to prepare heteroaryl ethers and thioethers using phenol and thiophenol nucleophiles. Time course NMR and HPLC-MS studies have facilitated explicit characterization of the proposed intermediates (the phosphonium salt and HOBt adduct); the data reveal a stepwise reaction pathway." @default.
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- W2013480765 date "2007-11-29" @default.
- W2013480765 modified "2023-09-26" @default.
- W2013480765 title "The Scope and Mechanism of Phosphonium-Mediated S<sub>N</sub>Ar Reactions in Heterocyclic Amides and Ureas" @default.
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- W2013480765 doi "https://doi.org/10.1021/jo7020373" @default.
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