The reaction of 4-aminobenzoic acid ethyl ester (I) with acryloyl chloride (II) by means of TEA in dichloromethane gives the corresponding acrylamide (III), which is condensed with 4,5,6,7-tetrahydro-1H-indol-4-one (IV) by means of K2CO3 in hot DMF to yield NEO-339. (1,2)