(3S,6S)-3-(2-(methylthio)ethyl)-6-phenylpiperazin-2-one   、                                                                                      
5-(4-氟苯基)异噁唑-3-羧酸   、                                                                                      
(3S,6S)-4-cinnamoyl-3,6-diisobutylpiperazin-2-one                                                                                                                                                                                                                                                                                                          以to furnish 458 (85 mg, 86.5% yield) as a white solid的产率得到(3R,6S)-4-(5-(4-fluorophenyl)isoxazole-3-carbonyl)-3-((methylthio)ethyl)-6-phenylpiperazin-2-one