Hydrochloric Acid → HCID 69974596, compound

Participants

Reaction Steps

Sodium hydroxide, 1N, (20.5 mL, 20.5 mmol, 1.10 equivalents) was added to a dioxane solution of 2-acetylamino-2-[3-(1-tert-butoxycarbonylamino-3-methyl-butyl)-isoxazol-5-ylmethyl]-malonic acid diethyl ester (8.99 g, 18.6 mmol, 1.0 equivalents) at room temperature over 30 minutes and the reaction was stirred overnight. The reaction was diluted with ethyl acetate (200 mL) and acidified to pH=1-1.5 with 1 N hydrochloric acid. The organic portion was washed with brine (200 mL) and dried over sodium sulfate. The solvent was removed in vacuo to give 8.589 of a 1:1 mixture (by 1H NMR) of 2-Acetylamino-2-[3-(1-tert-butoxycarbonylamino-3-methyl-butyl)-isoxazol-5-ylmethyl]-malonic acid monoethyl ester [MS (Cl) m/z 356.3 (M-99)] and the decarboxylated title compound [MS (CI) m/z 412.3 (M+1), 312.2 (M-99), 410.3(M−1)].

Provenance & Evidence