(3S,6S)-3-isobutyl-6-thiophen-3-yl-piperazin-2-one 、
3-(2,4-difluorophenyl)acrylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 451 (15 mg, 35.4% yield) as a white solid的产率得到(3S,6S)-4-((E)-3-(2,4-difluorophenyl)acryloyl)-3-isobutyl-6-(thiophen-3-yl)piperazin-2-one