1-Butynylbenzene → Methyl 4-ethyl-5-phenylisoxazole-3-carboxylate

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A solution of but-1-ynylbenzene (404 mg, 3.11 mmol) and dimethyl nitromalonate (0.381 mL, 2.82 mmol) in mesitylene (5 mL) was heated to 150° C. for 24 h. The reaction mixture was concentrated, and the residue purified on silica gel column with hexanes/ethyl acetate (10/1) to afford methyl 4-ethyl-5-phenylisoxazole-3-carboxylate (194 mg). The compound had an HPLC ret. time=3.25 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% H3PO; Start % B=0; Final % B=100. LC-MS: M+1=232+.

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