(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one 、
3-(4-氟苯基)-1,2-恶唑-5-羧酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 194 (71 mg, 77% yield) as a white solid的产率得到(3S,6S)-6-cyclopentyl-4-(3-(4-fluorophenyl)isoxazole-5-carbonyl)-3-isobutylpiperazin-2-one