(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one 、
(3S,6S)-3-isobutyl-6-isopropylpiperazin-2-one 、
5-(4-氟苯基)-1,2,4-噁二唑-3-羧酸 以to give the product 153 (27.1 mg, 17.4% yield) as a colorless oil的产率得到(3S,6S)-4-(3-(4-fluorophenyl)-1,2,4-oxadiazole-5-carbonyl)-3-isobutyl-6-isopropylpiperazin-2-one