(3S,6S)-4-(5-(3,4-difluorophenyl)isoxazole-3-carbonyl)-3,6-diisobutylpiperazin-2-one 、
(3S,6S)-3,6-diisobutylpiperazin-2-one 、
3-(4-氟苯基)-1,2-恶唑-5-羧酸 以to give the product 144 (50.9 mg, 27% yield) as a white solid的产率得到(3S,6S)-4-(3-(4-fluorophenyl)isoxazole-5-carbonyl)-3,6-diisobutylpiperazin-2-one