Hydrochloric Acid → HCID 10225152, compound

Participants

Reaction Steps

Lithium hydroxide hydrate (0.5 g) was added to a solution of methyl 4-[3-(2-ethoxy-ethyl)-3-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-ureido]-benzoate (39) (520 mg) dissolved in 20 mL THF, 5 mL methanol and 5 mL and the reaction mixture was stirred at room temperature for two hours. The reaction mixture was diluted with 20 mL water, the pH was adjusted to 2 with concentrated HCl and extracted with three 25 mL portions of ethyl acetate. The combined organic extracts were dried over MgSO4, filtered and concentrated in vacuo to give 400 mg of 4-[3-(2-ethoxy-ethyl)-3-(5,5,8,8-tetramethyl-5,6,7,8-tetrahydro-naphthalen-2-yl)-ureido]-benzoic acid (33) as a colorless oil, which crystallized upon addition of hexanes. M.P.: 82-85° C.

Provenance & Evidence