TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: Process in (1) involves: (A) under the cooling temperature of 0 plus minus 3 degrees C, dripping vitriol oil in the solution of L-phenylalanine, tetrahydrofuran (THF) and sodium borohydride; water bath stirring for 24 plus minus 4 hours; (B) adding sodium hydroxide solution; reacting for 5 plus minus 0.5 hours at 90-100 degrees C; distilling THF; (C) cooling down to 50 plus minus 5 degrees C; separating the organic phase; extracting the water phase by ethyl acetate; combining the organic phase; drying; condensing to dry; adding ethyl acetate and petroleum ether mixing liquid to re-crystallize; and obtaining the L-cinepazid amino alcohol. Process (1-A) also comprises the process of dripping water and analyzing the excess sodium borohydride.Process in (2) involves: (A) adding methanol and sodium methylate in phenylalinol; heating and stirring at 50 plus minus 5 degrees C to clear; cooling at room temperature; adding ethyl chlorocarbonate in the solution of methanol; stirring for 30 plus minus 5 minutes; (B) warming to 85 plus minus 5 degrees C; preserving the temperature; decompressing to distil out the methanol until more solid is separated out; adding water; using ethyl acetate to extract twice; combining the organic phase; using the brine to wash; drying and filtering; (C) decompressing and condensing to dry; adding ethyl acetate and petroleum ether mixing liquid to re-crystallize; and obtaining 4-benzyl-2-oxazole azululanone.Process in (3) involves: (A) adding dichloroethanes in (S)-4-benzyl-2-oxazole azululanone; stirring at room temperature; dripping 95% fuming nitric acid; reacting for 2 plus minus 0.5 hours at room temperature; (B) after using water and saturated sodium bicarbonate solution to wash; drying and rotating to dry; adding the mixing liquid of the ethyl acetate and the petroleum ether to re-crystallize; and obtaining (S)-4-benzyl-oxazolidin-2-one.Process in (4) involves: (A) adding methanol and 5% palladium carbon in (S)-4-benzyl-oxazolidin-2-one; hydrogenating until no hydrogen is adsorbed; (B) filtering; using the methanol to wash the filter cake; and condensing the filtrate to obtain the (S)-4-(4-amino-benzyl)-oxazolidin-2-one.Preferred Composition: Volume ratio of ethyl acetate and petroleum ether is 1:1-2. Preferred Conditions: In (2-B), the temperature persevering time is 1.5 plus minus 0.5 hours.