1,2,3-trimethylpiperazine   、                                                                                      tert-butyl (6aR)-4-chloro-1-fluoro-3-(2-fluoro-6-hydroxyphenyl)-12-oxo-6a,7,9,10-tetrahydro-12H-pyrazino[2,1-c]pyrido[3,4-f][1,4]oxazepine-8(6H)-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以62 %的产率得到tert-butyl (6aR)-4-chloro-3-(2-fluoro-6-hydroxyphenyl)-12-oxo-1-(2,3,4-trimethylpiperazin-1-yl)-6a,7,9,10-tetrahydro-12H-pyrazino[2,1-c]pyrido[3,4-f][1,4]oxazepine-8(6H)-carboxylate