(3S,6S)-6-cyclopentyl-3-isobutylpiperazin-2-one   、                                                                                      
5-(4-氯苯基)异噁唑-3-羧酸   、                                                                                      
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one                                                                                                                                                                                                                                                                                                          以to furnish 173 (57 mg, 59% yield) as a white solid的产率得到(3S,6S)-4-(5-(4-chlorophenyl)isoxazole-3-carbonyl)-6-cyclopentyl-3-isobutylpiperazin-2-one