O[NH:2][C:3](=[O:12])[C:4]1[CH:9]=[CH:8][C:7]([CH3:10])=[CH:6][C:5]=1[OH:11].C(N(CC)CC)C.S(Cl)(Cl)=O.Cl>O1CCCC1.O>[CH3:10][C:7]1[CH:8]=[CH:9][C:4]2[C:3]([OH:12])=[N:2][O:11][C:5]=2[CH:6]=144.0 g of N,2-dihydroxy-4-methylbenzamide was suspended in 880 mL of tetrahydrofuran, to which 147 mL of triethylamine was added dropwise at room temperature and then 28.7 mL of thionyl chloride was added dropwise at 5 to 10° C. successively, and this mixture was stirred for one hour at room temperature. The reaction mixture was added to water, and adjusted to pH 1 with 12M hydrochloric acid, and then resultant precipitate was filtered out thereof. The resultant solid was washed with water to yield 35.2 g of 6-methyl-1,2-benzisoxazol-3-ol as light yellow solid.
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