Introduction TFPN [tetrafluorophthalonitrile, 3,4,5,6-tetrafluorophthalonitrile] has in recent years been used for amide bond and peptide bond formation under carboxylic acid activation conditions. Published studies have shown that this route can be applied to sterically hindered substrates ...
Overview 2-Chloro-1-methylpyridinium iodide, abbreviated as CMPI, is a representative member of Mukaiyama-type carboxylic acid activation reagents and is often referred to as a Mukaiyama reagent; more precisely, it is one of the classic representatives of Mukaiyama-type ...
Overview When a carboxylic acid and an amine are used to form an amide bond in a triphenylphosphine-involved system, the first distinction to make is whether the process proceeds through stoichiometric activation or through a catalytic cycle in which triphenylphosphine oxide is reduced in ...
Introduction Triphenylphosphine dibromide (triphenylphosphine dibromide, PPh₃Br₂) is often classified as a brominating reagent, but its representative value in organic synthesis lies in more than simply “providing a bromine source.” Existing reagent overviews and methodological ...
1. Why it is still necessary to reassess TBTU today TBTU [O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate] has long been one of the most commonly used coupling reagents for carboxylic acid activation and amide bond formation, and has been widely employed in both ...
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