(Z)-2-Fluoro-4-[2-(3-oxo-butyryl)-2,3,4,9-tetrahydro-1H-β-carbolin-1-yl]-but-2-enoic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以62%的产率得到methyl (2S,4S,5S)-7-methyl-9-oxo-6-oxa-10,20-diazapentacyclo[11.7.0.02,10.04,8.014,19]icosa-1(13),7,14,16,18-pentaene-5-carboxylate