NOVELTY - Synthesis of sofosbuvir intermediate compound (I) involves reacting (3R,4R,5R)-3-fluoro-dihydro-4-hydroxy-5-hydroxymethyl-3-methyl-furan-2(3H)-one with pivaloyl chloride, reducing the resultant product, reacting with pivaloyl chloride, reacting product with hydrogen bromide, carrying out silyl-Hilbert-Johnson reaction of the resultant product and 1,2,3,4-tetrahydropyrimidine-2,4-dione (XVII), obtaining (2R,3R,4R,5R)-2-((acetyloxy)methyl)-5-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-1-yl)-4-fluoro-4-methyloxolan-3-yl 2,2-dimethylpropanoate (XVI) and reacting with sodium methoxide.    USE - Synthesis of sofosbuvir intermediate compound (claimed).    ADVANTAGE - The method enables simple, economical and environmentally-friendly synthesis of sofosbuvir intermediate compound.    DETAILED DESCRIPTION - Synthesis of sofosbuvir intermediate compound of formula (I) involves reacting (3R,4R,5R)-3-fluoro-dihydro-4-hydroxy-5-hydroxymethyl-3-methyl-furan-2(3H)-one with pivaloyl chloride, obtaining ((2R,3R,4R)-3-((2,2-dimethylpropanoyl)oxy)-4-fluoro-4-methyl-5-oxooxolan-2-yl)methyl 2,2-dimethylpropanoate of formula (XII), reducing, obtaining ((2R,3R,4R)-3-((2,2-dimethylpropanoyl)oxy)-4-fluoro-5-hydroxy-4-methyloxolan-2-yl)methyl 2,2-dimethylpropanoate of formula (XIII), reacting the resultant product with pivaloyl chloride, obtaining ((2R,3R,4R)-3,5-bis((2,2-dimethylpropanoyl)oxy)-4-fluoro-4-methyloxolan-2-yl)methyl 2,2-dimethylpropanoate of formula (XIV), reacting the resultant product with hydrogen bromide, obtaining ((2R,3R,4R)-5-bromo-3-((2,2-dimethylpropanoyl)oxy)-4-fluoro-4-methyloxolan-2-yl)methyl 2,2-dimethylpropanoate of formula (XV), carrying out silyl-Hilbert-Johnson reaction of the resultant product and 1,2,3,4-tetrahydropyrimidine-2,4-dione of formula (XVII), obtaining (2R,3R,4R,5R)-2-((acetyloxy)methyl)-5-(2,4-dioxo-1,2,3,4-tetrahydropyrimidin-1-yl)-4-fluoro-4-methyloxolan-3-yl 2,2-dimethylpropanoate of formula (XVI) and reacting the resultant product with sodium methoxide.