The invention provides an industrialized production method for high-purity
decitabine. The method comprises the following steps of: 1, performing
silanization reaction of 5-azacytosine, bis(
trimethylsilyl)amine and trimethyl
chlorosilane, which serve as raw materials, to prepare 2,4-bis(
trimethylsilyl)-5-azacytosine; 2, performing reaction of the product obtained by the step 1 and 1-chloro-3,5-bis-(4-chlorobenzoyl)-2-deoxy-D-ribofuranose, which serve as raw materials, to prepare a crude product of 1-(3,5-bis-(4-chlorobenzoyl)-2-deoxy-beta-D-ribofuranose)-5-azacytosine; 3, dissolving the product obtained by the step 2 in a C5 to C7
hydrocarbon, stirring, filtering and
drying to obtain a refined product; and 4, producing the high-purity
decitabine by using the product obtained by the step 3, methyl
alcohol and
sodium methoxide as raw materials. The method overcomes the disadvantages of need of column purification, low purity, difficult industrial production in the prior art, and has the advantages of simple and convenient operation, small
solvent consumption, small influence on the environment, low labor intensity, short period, high product purity, single
impurity and less than 0.1 percent total
impurity content.