tert-butyl 8-(2-oxo-4-(4-(trifluoromethyl)phenyl)pyridin-1(2H)-yl)-3,4-dihydropyrazino[1,2-a]benzimidazole-2(1H)-carboxylate 以38%的产率得到1-(1,2,3,4-tetrahydropyrazino[1,2-a]benzimidazol-8-yl)-4-[4-(trifluoromethyl)phenyl]pyridin-2(1H)-one monohydrochloride