Trifluoroacetic acid → (1R,2R)-ethyl 2-(4-hydroxyphenyl)cyclopropanecarboxylate

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Reaction Steps

(1R,2R)-2-(4-tert-Butoxy-phenyl)-cyclopropanecarboxylic acid ethyl ester (5.9 g, 22.5 mmol) is cooled to 0° C. and trifluoroacetic acid (14 mL, 182.5 mmol) is added. The mixture is stirred for 5 minutes and then concentrated under vacuum. The residue is reevaporated 3 times from dichloromethane then purified by flash chromatography (0-10% ethyl acetate in cyclohexane) to give the title compound (yield 3.10 g).

Provenance & Evidence