反应详情

Add a solution of HCl 4M in dioxane (4 equiv) to a solution of 4-(3-Methyl-5-nitro-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl ester (7.77 g, 24.13 mmol) in DCM (73 mL). Stir mixture at room temperature overnight. Add 2 more equiv of the HCl in dioxane solution. After no starting material is detected by LCMS, filter solid and dry under reduced pressure to obtain 6.91 g of 1-(3-methyl-5-nitro-pyridin-2-yl)-piperazine hydrochloride as a yellowish solid (97% yield). ES+(m/z): 259 [M+1].

1. filtrationfilter solid
2. customdry under reduced pressure