methyl (1R,2R,3R,7R,8R,12S,13S,16R,18S)-12-hydroxy-7-methoxy-16-methyl-9-oxo-17-azapentacyclo[10.7.1.02,11.03,8.013,18]icos-10-ene-10-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
N-氯代丁二酰亚胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 0.75h,
                                                                                                                以89%的产率得到methyl (1S,3R,6S,7S,9R,11S,15R,16R,20S)-11-hydroxy-16-methoxy-3-methyl-14-oxo-2-azahexacyclo[10.8.0.01,9.02,7.06,11.015,20]icos-12-ene-13-carboxylate