Phenyl-t-butylacetylene → Methyl 4-tert-butyl-5-phenylisoxazole-3-carboxylate

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A solution of (3,3-Dimethylbut-1-ynyl)benzene (400 mg, 2.53 mmol) and dimethyl nitromalonate (0.853 mL, 6.32 mmol) in mesitylene (5 mL) was heated at 150° C. for 48 h. The reaction mixture was concentrated, and the residue was purified by silica gel chromatography with hexanes/ethyl acetate (10/1) to yield methyl 4-tert-butyl-5-phenylisoxazole-3-carboxylate (101 mg). The compound had an HPLC ret. time=3.39 min.−Column. YMC S5 COMBISCREEN® 4.6×50 mm; Gradient time: 4 min; Flow rate=4 ml/min; Solvent A=10% MeOH−90% Water−0.2% H3PO4; Solvent B=90% MeOH−10% water−0.2% H3PO4; Start % B=0; Final % B=100. LC-MS: M+1=260+.

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