(3S,6S)-3-Isobutyl-6-propenyl-piperazin-2-one 、
(1R,2R)-trans-2-phenyl-1-cyclopropanecarboxylic acid 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 422 (12 mg, 17.3% yield) as a white solid的产率得到(3S,6S)-3-isobutyl-4-((1R,2R)-2-phenylcyclopropanecarbonyl)-6-((E)-prop-1-en-1-yl)piperazin-2-one