6-benzyl-2-chloro-8-methyl-7,8-dihydro-5H-1,6-naphthyridine 、
(S)-(+)-2-丁醇 以8-methyl-2-[(1S)-1-methylpropoxy]-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride (0.136 g, 29%) was obtained as a white powder的产率得到8-methyl-2-[(1S)-1-methylpropoxy]-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride