tert-Butyl (triphenylphosphoranylidene) acetate → Cyclobutanecarboxylic acid, 3-[2-(1,1-dimethylethoxy)-2-oxoethylidene]-

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Reaction Conditions

Reaction Steps

A mixture of 3-oxocyclobutanecarboxylic acid (0.303 g, 2.66 mmol), tert-butyl triphenylphosphoranylidenacetate (1 g, 2.66 mmol) and toluene (5 mL) was stirred overnight at 90° C. The reaction solution was concentrated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (solvent gradient; 70→100% ethyl acetate/hexane) to give 3-(2-(tert-butoxy)-2-oxoethylidene)cyclobutanecarboxylic acid (0.500 g, 2.356 mmol, 89%) as pale-yellow crystals.

Provenance & Evidence