6-benzyl-2-chloro-8-methyl-7,8-dihydro-5H-1,6-naphthyridine 、 3-Propylmorpholine p-toluenesulfonate 以8-methyl-2-(3-propylmorpholin-4-yl)-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride (0.0777 g, 23%) was obtained as a yellow powder的产率得到8-methyl-2-(3-propylmorpholin-4-yl)-5,6,7,8-tetrahydro-1,6-naphthyridine hydrochloride