Lithium Hydroxide → HCID 57495635, compound

Participants

Reaction Steps

A solution of 76 mg (2.1 mmol) 4-(1-Cyclopropyl-2-oxo-1,3-diaza-spiro[4.6]undec-3-yl)-benzoic acid ethyl ester in 2 ml THF/Methanol 1.1 was treated with 0.5 ml of 1N LiOH. After stirring for 3 h the reaction mixture was acidified with 1N HCL, taken up in EtOAc and washed with water to give 65.5 mg of pure 4-(1-cyclopropyl-2-oxo-1,3-diaza-spiro[4.6]undec-3-yl)-benzoic acid MS (API): 327.5 (M−H). A solution of 47 mg (1.3 mmol) 4-(1-cyclopropyl-2-oxo-1,3-diaza-spiro[4.6]undec-3-yl)-benzoic acid and 27 mg (0.16 mmol) of 1,1-carbonyl diimidazole in 1 ml of THF was stirred under reflux for 1 h, then 32 mg (0.4 mmol) of Ammonium acetate was added and the stirring under reflux was continued for another 2 h. The reaction mixture was taken up in EtOAc and washed with 1N HCL and water. The crude product was crystallized in Ether/Heptan to give 25 mg of pure 4-(1-Cyclopropyl-2-oxo-1,3-diaza-spiro[4.6]undec-3-yl)-benzamide. MS (ESI): 328.4 (MH+).

Provenance & Evidence