[Li]CCCC.I[C:7]1[C:8]([CH3:13])=[N:9][O:10][C:11]=1[CH3:12].[CH2:14]([Sn:18](Cl)([CH2:23][CH2:24][CH2:25][CH3:26])[CH2:19][CH2:20][CH2:21][CH3:22])[CH2:15][CH2:16][CH3:17]>C1COCC1>[CH3:13][C:8]1[C:7]([Sn:18]([CH2:19][CH2:20][CH2:21][CH3:22])([CH2:23][CH2:24][CH2:25][CH3:26])[CH2:14][CH2:15][CH2:16][CH3:17])=[C:11]([CH3:12])[O:10][N:9]=1n-BuLi (1.6 M solution in hexanes, 6 mL, 9.6 mmol) was added to a cooled (−78° C.) solution of 4-iodo-3,5-dimethylisoxazole (1.47 g, 6.60 mmol) in THF (24 mL) under nitrogen. After 15 min, tributyltin chloride (26 mL, 9.60 mmol) was added and the reaction was stirred over night while warming to room temperature. The reaction was quenched by 1 M HCl, CH2Cl2 was added, the phases separated and the solvent were evaporated. The residue was purified by flash chromatography with heptane: CH2Cl2 (75:25-0:100) to give 3,5-dimethyl-4-(tributylstannyl)isoxazole (1.00 g, 39%).
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