(3S,6S)-6-(cyclopropylmethyl)-3-isobutylpiperazin-2-one 、
5-(4-氯苯基)异噁唑-3-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 166 (53 mg, 54% yield) as white solid的产率得到(3S,6S)-4-(5-(4-chlorophenyl)isoxazole-3-carbonyl)-6-(cyclopropylmethyl)-3-isobutylpiperazin-2-one