Hydrochloric Acid → HCID 136197531, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of semicarbazide hydrochloride (5.00 g, 44.8 mmol) in DCM (100 mL) was added triethylamine (10.00 g, 99 mmol) and the mixture was stirred at −10° C. for 30 min. Cyclopentane carbonylchloride (5.00 g, 37.7 mmol) was added at the same temp and the mixture was allowed to warm to RT over night. The solvent from the reaction mixture was completely removed and the residue stirred in MeCN (200 mL) for 1 h. The solids were collected by filtration, washed and dried. The solid was treated with sodium hydroxide (7.00 g, 175 mmol) and water (20 mL). The resulting reaction mixture was heated at 100° C. for 3 h. The reaction mixture was cooled and acidified with conc. HCl. The solids were collected, washed and dried to provide 3-cyclopentyl-1H-1,2,4-triazol-5(4H)-one (2.24 g, 38.8% yield) as white solid. 1H NMR (400 MHz, DMSO-d6): δ 11.17 (s, 1H), 11.03 (s, 1H), 2.80 (m, 1H), 1.86 (m, 2H), 1.58 (m, 6H); MS (ESI) m/z: 154.1 (M+H+).

Provenance & Evidence