(3S,6S)-3-isobutyl-6-isopropylpiperazin-2-one 、
(1R,2R)-trans-2-phenyl-1-cyclopropanecarboxylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 233 (73 mg, 85% yield) as a white solid的产率得到(3S,6S)-3-isobutyl-6-isopropyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)piperazin-2-one