2) using pyridine as raw material and pyridine N-oxide et al as medium products ;3) 4-pyridyl-pyridinium dichloride (dibromide) as medium products.

• 以吡啶为原料,经氧化、硝化、铁-酸还原或催化加氢合成4-氨基吡啶及其他合成4-氨基吡啶的路线;