(3S,6S)-6-(cyclopropylmethyl)-3-isobutylpiperazin-2-one 、
5-(2-噻吩基)-3-异恶唑酸 、
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one 以to furnish 168 (69 mg, 75% yield) as a brown solid的产率得到(3S,6S)-6-(cyclopropylmethyl)-3-isobutyl-4-(5-(thiophen-2-yl)isoxazole-3-carbonyl)piperazin-2-one