(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 、
6,7-dihydro-[1,4]dioxino[2,3-c]pyridazine-3-carbaldehyde 以to afford the free base of the title compound as a white solid (0.095 g, 40%)的产率得到(6S)-6-({4-[(6/7-dihydro[1,4]dioxino[2,3-c]pyridazin-3-ylmethyl)amino]-1-piperidinyl}methyl)-3-fluoro-5,6-dihydro-8H-[1,4]oxazino[2,3,4-de]-1,5-naphthyridin-8-one