Acetic acid, 2-(triphenylphosphoranylidene)-, methyl ester → Methyl 2-(6-hydroxy-1-benzofuran-3-yl)acetate

참여 물질

반응 단계

A mixture of 6-hydroxy-(2H)-benzofuran-3-one (5.0 g, 33.3 mmol), methyl (triphenylphosphoranylidene)acetate (25.0 g, 73 mmol), and xylenes (100 mL) is refluxed 6 hr. The reaction is concentrated and diluted with enough 1M aqueous hydrochloric acid to adjust pH to 2-3. The product is extracted into ethyl acetate (3×100 mL). The combined extracts are dried over anhydrous magnesium sulfate, filtered and concentrated. The residue is purified via silica chromatography eluting with 7:3 hexanes:ethyl acetate to afford the product as a orange oil, 1.3 g, 20%. MS M++1 207. The structure is confirmed by 1H NMR spectroscopy.

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