[Cl:1][C:2]1[CH:11]=[CH:10][C:5]2[C:6]([OH:9])=[N:7][O:8][C:4]=2[CH:3]=1.C(=O)([O-])[O-].[K+].[K+].Br[CH:19]([CH3:24])[C:20]([O:22][CH3:23])=[O:21].Cl>CN(C)C=O.O>[Cl:1][C:2]1[CH:11]=[CH:10][C:5]2[C:6]([O:9][CH:19]([CH3:24])[C:20]([O:22][CH3:23])=[O:21])=[N:7][O:8][C:4]=2[CH:3]=1
A mixture of 6-chloro-1,2-benzisoxazol-3-ol (6.8 g, 40.1 mmol), potassium carbonate (8.3 g, 60 mmol) and methyl 2-bromopropionate (10.0 g, 60.1 mmol) in N,N-dimethylformamide is stirred at room temperature overnight and diluted with water. The resultant aqueous mixture is acidified with concentrated hydrochloric acid (pH5-pH6) and extracted with methylene chloride. The combined organic extracts are diluted with hexanes, washed with water, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a residue. Column chromatography of the residue using silica gel and ethyl acetate/hexanes solutions gives the title product as a gold oil which is identified by NMR spectral analyses.
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