(3S,6S)-3-isobutyl-6-thiophen-3-yl-piperazin-2-one 、
5-(4-氟苯基)-1,2,4-噁二唑-3-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 446 (95 mg, 88.1% yield) as a white solid的产率得到(3S,6S)-4-(5-(4-fluorophenyl)-1,2,4-oxadiazole-3-carbonyl)-3-isobutyl-6-(thiophen-3-yl)piperazin-2-one