6-benzyl-2-chloro-8-methyl-7,8-dihydro-5H-1,6-naphthyridine 、
(R)-(-)-2-丁醇 以8-methyl-2-[(1R)-1-methylpropoxy]-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride (0.147 g, 31%) was obtained as a white powder的产率得到8-methyl-2-[(1R)-1-methylpropoxy]-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride