(3S,6S)-3-isobutyl-6-thiophen-3-yl-piperazin-2-one 、
3-(4-氟苯基)-1,2-恶唑-5-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 450 (8 mg, 18.6% yield) as a white solid的产率得到(3S,6S)-4-(3-(4-fluorophenyl)isoxazole-5-carbonyl)-3-isobutyl-6-(thiophen-3-yl)piperazin-2-one