2-(4-Fluoro-phenyl)-4-[(4-fluoro-phenyl)-hydrazono]-5-((1S,2S)-1,2,3-trihydroxy-propyl)-2,4-dihydro-pyrazol-3-one                                                                                                                                                              在
                                                                                                                                                                                 
氢溴酸   、                                                                                                  
溶剂黄146                                                                                                                                  作用下,
                                                                                                                                                                                                                            以70%的产率得到3-(2-O-acetyl-1,3-dibromo-1,3-dideoxy-L-erythro-glycerol-1-yl)-1-(p-fluorophenyl)pyrazoline-4,5-dione 4-(p-fluorophenylhydrazone)