4-[(4-chlorophenoxy)methyl]-10-phenyl-2H-thiopyrano[2,3-b][1,8]naphthyridin-5-one                                                                                                                                                              在
                                                                                                                                                                                 
三氯化铝                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以75%的产率得到(2R,10S)-7-chloro-2-methyl-14-phenyl-3-oxa-12-thia-14,16-diazapentacyclo[11.8.0.02,10.04,9.015,20]henicosa-1(13),4(9),5,7,15(20),16,18-heptaen-21-one