Patent ID: 8912309

Claim:
A preparation method for the compound of Formula 1, wherein said method comprises the following steps: (a) mixing the compound of Formula 2 with a strong leaving-group compound 5, thereby obtaining the compound of Formula 3; (b) mixing the compound of Formula 3 with ethylenediamine to obtain the compound of Formula 4; and (c) mixing the compound of Formula 4 with a hydroxyl protectant, and then with a borane complex to obtain the compound of Formula 1; wherein in step (a), the strong leaving-group compound 5 is a sulphydryl-substituted aromatic ring compound, and wherein, in obtaining Formula 3, in the sulphydryl-substituted aromatic ring compound R 1 is selected from hydroxy, benzyloxy, phenoxy, substituted phenoxy, or substituted benzyloxy, and R 2 , R 3 , R 4 and R 5 are selected from hydrogen, C1-C6 alkyl, C1-C6 alkoxy, hydroxyl, benzyloxyphenyl, substituted benzyloxyphenyl, nitro, fluorine, chlorine, bromine, or iodine.