6-benzyl-2-chloro-8-methyl-7,8-dihydro-5H-1,6-naphthyridine 、
2,5-二甲基吡咯烷 以2-(2,5-dimethylpyrrolidin-1-yl)-8-methyl-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride (0.140 g, 27%) was obtained as a yellow powder的产率得到2-(2,5-dimethylpyrrolidin-1-yl)-8-methyl-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride