(3S,6S)-3,6-diisobutyl-4-((5-phenylisoxazol-3-yl)methyl)piperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、
5-(4-甲苯基)异噁唑-3-甲醛 以to give the product 199 (91.4 mg, 50.7% yield) as a white solid的产率得到(3S,6S)-3,6-diisobutyl-4-((5-(p-tolyl)isoxazol-3-yl)methyl)piperazin-2-one