Practical Synthesis of 1-Aryl-6-(hydroxymethyl)-2-ketopiperazines via a 6-exo Amide−Epoxide Cyclization

Chiral 1-aryl-6-(hydroxymethyl)-2-ketopiperazines can be prepared via an operationally simple, 6-exo epoxide ring-opening cyclization to form the ketopiperazine C6−N1 bond in high yields and with excellent enantiomeric purity.