A convenient and rapid synthesis of potassium penicilliantes using EEDQ

Abstract
N‐ethoxycarbonyl‐2‐ethoxy‐1,2‐dihydroquinoline (EEDQ, 1) has been utilized as a coupling reagent to attach sterically unhindered acids to the potassium salt of 6‐aminopenicillanic acid (4) at room temperature.The excellent yields and rapidity of the reaction illustrate the convenience of utilizing 1 as the coupling reagent to directly prepare the potassium salt of certain penicillins.