Synthesis of 2-oxazolines via boron esters of N-(2-hydroxyethyl) amides

Abstract A new, convenient, one-pot process is presented for the synthesis of 2-oxazolines in high yields (75–94%) via boron esters of N-(2-hydroxyethyl) amides. The procedure involves thermolysis of the boron esters at 240–260 °C, in the presence of solid CaO as an acid scavenger and allows the preparation of oxazolines from hydroxyethyl amides of aliphatic and aromatic monocarboxylic acids.