1,1-dimethylethyl (1-{[(6S)-3-fluoro-8-oxo-5,6-dihydro-8H-[1,4]oxazino[2,3,4-de]-1,5-naphthyridin-6-yl]methyl}-4-piperidinyl)carbamate   、                                                                                      
盐酸   、                                                                                      
1,4-二氧六环                                                                                                                                                                                              以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以to yield the title compound as a white free-flowing solid (0.236 g >100%)的产率得到(6S)-6-[(4-Amino-1-piperidinyl)methyl]-3-fluoro-5,6-dihydro-8H-[1,4]oxazino[2,3,4-de]-1,5-naphthyridin-8-one dihydrochloride