(3S,6S)-3-cyclopropylmethyl-6-phenyl-piperazin-2-one 、
5-(4-氟苯基)异噁唑-3-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish compound 336 (73 mg, 80% yield) as a colorless solid的产率得到(3S,6S)-3-(cyclopropylmethyl)-4-(5-(4-fluorophenyl)isoxazole-3-carbonyl)-6-phenylpiperazin-2-one