NOVELTY - Methoxymethylacetate and methyl formate are condensed under strong-alkali condition, and subjected to cyclization with thiourea. The resultant product is subjected to methylation process using chloromethane, and chlorinated using phosphorus oxychloride. The obtained product is then subjected to hydrazination using hydrazine hydrate, and cyclized using ccyanogen bromide under strong alkali and acrylate to obtain 2-amino-5,8-dimethoxy(1,2,4)-triazolo(1,5-c)-pyrimidine.    USE - Preparation of amino-dimethoxytriazolo pyrimidine used as intermediate for preparing penoxsulam used as herbicide for paddy.    ADVANTAGE - The method efficiently provides amino-dimethoxytriazolo pyrimidine having yield of more than 39%, without affecting the environment.    DETAILED DESCRIPTION - 29 g Tetrahydrofuran is mixed with 400 ml base (a), cooled in ice-water bath to 5 degrees C, and 67.4 g methylmethoxyacetate and 48 g of mixed solution of methyl formate mixture are dripped at 10-20 degrees C for 5 hours. Solvent is then removed under reduced pressure to obtain 3-hydroxy-2-methoxy-acrylate sodium salt. Solution of 3-hydroxy-2-methoxy-acrylate sodium salt is added to 300 ml methanol, and 50 g thiourea and 48 g base (b) are added and reacted at 40-60 degrees C for 12 hours. The resultant mixture is then cooled to room temperature, and solvent is removed by rotary evaporation. Water (300 ml) is added to resultant mixture, and pH is adjusted using hydrochloric acid to 3-4, filtered, washed with water, and dried to obtain 2-mercapto-5-methoxy-4-hydroxy-pyrimidine. 58.7 g 2-Mercapto-5-methoxy-4-hydroxy-pyrimidine is added to sodium hydroxide solution at 15-70 degrees C, and chloride is introduced. The obtained product is then cooled under ice bath, and pH is adjusted using hydrochloric acid to 4-5, filtered. The obtained product is then washed using water, and dried at 60 degrees C to obtain 2-methylthio-5-methoxy-4-hydroxy-pyrimidine. 50 g 2-Methylthio-5-methoxy-4-hydroxypyrimidine and 100 ml acetonitrile are mixed with 80.76 g phosphorus oxychloride, and 44.5 g triethylamine is dripped and refluxed for 2 hours. The resultant mixture is then cooled to room temperature, and poured into 300 ml ice water. The obtained mixture is stirred, and precipitated yellow solid is filtered, washed with water and dried to obtain 5-methoxy-2-methylthio-4-chloro-pyrimidine. 53 g 5-Methoxy-2-methylthio-4-chloro-pyrimidine is added to 350 ml absolute ethanol, and 63 ml of 80% aqueous solution of hydrazine hydrate is added and refluxed for 1.5 hours. The reaction mixture is then cooled in ice-water bath, and precipitated white solid is filtered and dried to obtain 5-methoxy-2-methylthio-4-hydrazino-pyrimidine. 45 g 5-Methoxy-2-methylthio-4-hydrazino-pyrimidine is added to 505 ml isopropanol, and 35.2 g bromine is dissolved in 100 g cyano acetonitrile. Bromine cyano acetonitrile is added to resultant mixture, refluxed for 2 hours, cooled to room temperature, poured into aqueous sodium bicarbonate and stirred for 1 hour. The obtained white solid is precipitated, filtered and dried at 60 degrees C to obtain 3-amino-5-(methylthio)-8-methoxy-(1,2,4)triazolo(4,3-c)pyrimidine. 30 g 3-Amino-5-methylthio-8-methoxy(1,2,4)triazolo(4,3-c)pyrimidine is added to alkaline solution of methanol, and 18.4 g acrylate is added. The resultant mixture is reacted at 50 degrees C for 8 hours, and cooled in ice bath. The obtained mixture is cooled, stirred for 1 hour, filtered and dried at 60 degrees C to obtain 2-amino-5,8-dimethoxy(1,2,4)triazolo(1,5-c)pyrimidine. The base (a) is sodium methoxide, sodium ethoxide, sodium hydride, sodium amide, sodium hydroxide or potassium hydroxide. The base (b) is sodium methoxide, sodium ethoxide, sodium hydride, sodium amide, sodium hydroxide or potassium hydroxide. Base used during preparation of 2-amino-5,8-dimethoxy(1,2,4)triazolo(1,5-c)pyrimidine, is sodium methoxide, sodium ethoxide, sodium hydride, sodium amide, sodium hydroxide or potassium hydroxide. The acrylate is isobornyl acrylate, methyl acrylate, ethyl acrylate, methyl methacrylate, butyl methacrylate, isobutyl methacrylate, dodecyl acrylate, methacrylate or isobornyl acrylate.