[CH2:1]([OH:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[H-].[Na+].[Cl:11][C:12]1[CH:17]=[N:16][CH:15]=[C:14](Cl)[N:13]=1.O>C1C=CC=CC=1>[CH2:1]([O:8][C:14]1[CH:15]=[N:16][CH:17]=[C:12]([Cl:11])[N:13]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=17.6 g of benzylalcohol was dissolved in 65 ml of benzene, and 2.8 g of 60% sodium hydride was added little by little to the solution under stirring not so as to foam too much at room temperature. After the addition, stirring was continued for 10 min. at room temperature, followed by reflux for 1 hour. Subsequently, the solution was cooled to 50° to 60° C., and added dropwise with a solution of 10 g of 2,6-dichloropyrazine in 65 ml of benzene for 10 min. Then, after reflux for 4 hours, the reaction was finished. After cooling below 10° C., about 100 ml of water was added, and the separated benzene layer was collected. The residue obtained by distilling off the solvent was purified by silica-gel column chromatography (developing solvent: n-hexane and ethyl acetate) to obtain 12.8 g of 2-benzyloxy-6-chloropyrazine as a colourless oil (yield: 86.5%)
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