Isopropylamine → HCID 68675444, compound

Participants

Reaction Steps

A solution of 580 mg of 3-(2-tert-butyl-8-chloro-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-6-yl)-benzoic acid methyl ester and 944 mg of isopropylamine in THF (8.0 mL) was stirred at ambient temperature. After 72 h, the reaction was diluted with EtOAc and washed with water followed by sat. sodium chloride solution. The organic layer was dried over sodium sulfate, filtered, and concentrated to an orange semi-solid. This material was dissolved in 1,4-dioxane (6.0 mL) and 2N KOH (1.0 mL) was added. This mixture was heated at reflux for 16 h, cooled to ambient temperature and the solvent removed. The residue was dissolved in water and the pH adjusted to 3 with 2N HCl prior to extraction with 9:1 chloroform/MeOH (3×). The organic extracts were washed with sat. sodium chloride solution, dried over sodium sulfate, filtered, and concentrated to leave 3-(2-tert-butyl-8-isopropylamino-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-6-yl)-benzoic acid as a yellow solid. MS (M+H+)=370.4.

Provenance & Evidence