TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The preparation of compound (I) is carried out at 10-50 (preferably 15-30) degrees C in solvent comprising methanol, ethanol and/or acetone, under the action of alkali comprising potassium carbonate, potassium hydroxide, sodium methoxide and sodium ethoxide. The compound (II) is prepared by processing glycosylation of hydroxyl to compound (III) and/or (IV), or (V) at 30-80 degrees C in solvent comprising organic solvent and water under the action of alkali comprising potassium carbonate, sodium carbonate, potassium hydroxide and/or sodium hydroxide, and phase transfer catalyst comprising tetrabutylammonium bromide, Aliquat 336 (RTM: tricaprylmethylammonium chloride), triethylbenzyl ammonium chloride, 18-C-6, DB-18-C-6 and/or tetrabutylammonium chloride. The compound (III) is prepared by processing dehydroaromatization to compound of formula (VI) at 80-115 degrees C under the action of oxidant i.e. 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and/or iodine, and organic solvent comprising toluene, 1,4-toluene, dichloromethane, ethyl acetate, petroleum ether and/or pyridine. The compound (VI) is prepared by processing nucleophilic substitution to compound (I') and compound (II') (0.1-4 times the molar weight of compound (I')), at 30-80 degrees C, in solvent comprising dimethylformamide, trichloromethane, dichloromethane, petroleum ether and/or ethyl acetate, with water and phase transfer catalyst (0.01-2 times the molar weight of compound (I')), and under the action of inorganic strong alkali (0.01-2.5 times the molar weight of compound (I')). Preferred Composition: In preparation of compound (I), the amount of alkali is 2-6 (preferably 3-5) times the molar weight of compound (II). In preparation of compound (II), the amount of alkali is 1-5 times the molar weight of compound (III). The amount of phase transfer catalyst is 0.01-0.8 times the molar weight of compound (III). The amount of (compound IV) or compound (V) is 1-5 times the molar weight of compound (III). The amount of oxidant is 0.1-5 times the molar weight of compound (VI).