Citric Acid → HCID 90204397, compound

Participants

Reaction Steps

In a 250 mL round-bottomed flask, tert-butyl 2-[(E)-(4-chlorophenyl)methyleneamino]-3-cyclopropyl-2-methyl-propanoate (example 186a, 1.7 g, 5.28 mmol) and citric acid (1.8 g, 9.37 mmol) were combined with THF (30 ml) and water (5 ml) to give a yellow solution. The reaction mixture was stirred at room temperature for 20 h. The reaction mixture was poured into 200 mL ethyl acetate and extracted with an iced 1 M aqueous solution of sodium hydroxide and brine. The aqueous layer was back-extracted with ethyl acetate. The combined organic layers were dried over sodium sulfate and evaporated down to dryness. The crude material was purified by flash chromatography on silica eluting with a heptane/ethyl acetate gradient to yield the title compound (452 mg, 43%). MS (ESI, m/z): 200.1 (M+H+).

Provenance & Evidence