(3S,6S)-3-Isobutyl-6-propenyl-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 447 (35 mg, 44.6% yield) as a white solid的产率得到(3S,6S)-4-(3-(4-fluorophenyl)isoxazole-5-carbonyl)-3-isobutyl-6-((E)-prop-1-en-1-yl)piperazin-2-one