Ethylene Glycol → Ethyl 2-[4-chloro-3-fluoro-2-iodo-6-(2-methyl-1,3-dioxolan-2-yl)phenoxy]propanoate

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Reaction Steps

A solution of ethyl 2-(6-acetyl-4-chloro-3-fluoro-2-iodophenoxy)propanoate (3.58 g, 8.63 mmol) and 1,2-ethanediol (1.20 mL, 21.6 mmol) in toluene (16.3 mL) was treated with p-toluenesulfonic acid monohydrate (246 mg, 1.30 mmol) and heated at reflux in a flask fitted with a Dean-Stark trap filled with sieves. The reaction mixture was cooled and poured into saturated sodium bicarbonate (150 mL) and extracted with ethyl acetate (2×200 mL). The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated to give a crude residue. Purification by flash column chromatography (100% hexanes to 10% EtOAc/hexanes) gave the desired product (2.25 g, 57%) as a mixture of enantiomers. LCMS calculated for C15H18ClFIO5 (M+H)+: m/z=459.0; found: 459.0.

Provenance & Evidence