5-phenyl-2-(4-trimethylsilanyl-but-3-ynyl)-2H-pyrazole → 2-but-3-ynyl-5-phenyl-2H-pyrazole

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Reaction Steps

The title compounds were prepared in accordance with the general method of Example 108(B), from 5-phenyl-1-(4-trimethylsilanyl-but-3-ynyl)-1H-pyrazole and 5-phenyl-2-(4-trimethylsilanyl-but-3-ynyl)-2H-pyrazole (300 mg, 1.12 mmol). The crude residue was purified by flash chromatography (cyclohexane/AcOEt 9:1) to yield 29 mg (0.15 mmol, 13%) of 2-but-3-ynyl-5-phenyl-2H-pyrazole and 13 mg (66 μmol, 6%) of 1-but-3-ynyl-5-phenyl-1H-pyrazole.

Provenance & Evidence