(3S,6S)-3,6-diisobutylpiperazin-2-one 、 (1R,2R)-2-(2,4-difluorophenyl)cyclopropanecarboxylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish product 421 (35 mg, 42.8% yield) as a white solid的产率得到(3S,6S)-4-[(1S,2S)-2-(2,4-difluoro-phenyl)-cyclopropanecarbonyl]-3,6-diisobutyl-piperazin-2-one