Hydrochloric Acid → HCID 86713151, compound

Participants

Reaction Steps

(2Z)-3-Ethyl-5-(8-hydroxy-2,3,7,9,9-pentamethyl-1,4-dioxaspiro[4.5]dec-6-en-8-yl)-N-propylpent-2-en-4-ynamide (280 mg, 0.72 mmol) was dissolved in acetone (4 ml) under argon in a round-bottom flask, and 10% strength hydrochloric acid was added. The resulting reaction solution was stirred at room temperature for 50 minutes, and water was then added. After removing acetone under reduced pressure, the aqueous phase was extracted repeatedly with dichloromethane. The combined organic phases were dried over magnesium sulfate, filtered and concentrated under reduced pressure. By final column chromatography purification of the resulting crude product (ethyl acetate/heptane gradient), it was possible to obtain (2Z)-3-ethyl-5-(1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl)-N-propylpent-2-en-4-ynamide (200 mg, 88% of theory) in the form of a colorless solid. 1H-NMR (400 MHz, CDCl3 δ, ppm) 6.08 (br. t, 1H, NH), 6.00 (s, 1H), 5.87 (s, 1H), 3.54 (br. s, 1H, OH), 3.27 (m, 2H), 2.53 (d, 1H), 2.42 (d, 1H), 2.27 (q, 2H), 2.17 (s, 3H), 1.56 (sext, 2H), 1.22 (s, 3H), 1.13 (s, 3H), 1.11 (t, 3H), 0.93 (t, 3H).

Provenance & Evidence