(3S,6S)-3-Isobutyl-6-propenyl-piperazin-2-one 、
3-(2,4-difluorophenyl)acrylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 449 (55 mg, 74.5% yield) as a white solid的产率得到(3S,6S)-4-((E)-3-(2,4-difluorophenyl)acryloyl)-3-isobutyl-6-((E)-prop-1-en-1-yl)piperazin-2-one