2,2,2-trifluoroacetohydrazide

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of methyl 4-(pentylamino)-1H-imidazole-5-carbimidothioate (0.53 g, 2.4 mmol) and trifluoroacetic acid hydrazide (0.45 g, 3.5 mmol) in ethanol (10 mL) was refluxed overnight. The reaction mixture was concentrated to yield the product as slightly green viscous oil. LCMS calculated for C11H16F3N6(M+H): 289.1. found: 289.1. was refluxed overnight The reaction mixture was concentrated to yield the product as slightly green viscous oil

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of methyl 4-(pentylamino)-1H-imidazole-5-carbimidothioate (0.53 g, 2.4 mmol) and trifluoroacetic acid hydrazide (0.45 g, 3.5 mmol) in ethanol (10 mL) was refluxed overnight. The reaction mixture was concentrated to yield the product as slightly green viscous oil. LCMS calculated for C11H16F3N6(M+H): 289.1. found: 289.1. was refluxed overnight The reaction mixture was concentrated to yield the product as slightly green viscous oil

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To solution of (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carboxylic acid 1 (0.25 g, 0.90 mmol) in dry DCM (20 mL) were added 2,2,2-trifluoroacetohydrazide 184 (0.17 g, 1.35 mmol, Aldrich), 1-hydroxybenzotriazole (0.19 g, 1.35 mmol), 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride (0.26 g, 1.35 mmol) and 4-(dimethylamino)pyridine (0.16 g, 1.35 mmol) at room temperature. The reaction mixture was stirred at room temperature overnight and concentrated under vacuum. The residue was purified by column chromatography to give (2R,5R)-6-(benzyloxy)-7-oxo-N′-(trifluoroacetyl)-1,6-diazabicyclo[3.2.1]octane-2-carbohydrazide 185 (0.224 g, 65%) as a white solid. concentrated under vacuum The residue was purified by column chromatography

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Trifluoroacetic acid (7.6 mL, 0.1 mol) was added to a stirred solution of trifluoroacethydrazide (12.8 g, 0.1 mol) in benzene (100 mL) and the mixture was heated under reflux for 2 h. A Dean and Stark trap was fitted, and reflux was continued for 3 h. Reflux was continued in the absence of the Dean and Stark trap (3 h) and then with the trap refitted (20 h). The resulting white solid was collected by filtration, dried in vacuum and identified as 1,2-bis(trifluoroacetyl)hydrazine (16.5 g, 73%). M.p. 173-175° C. the mixture was heated under reflux for 2 h A Dean and Stark trap was fitted reflux Reflux was continued in the absence of the Dean and Stark trap (3 h) (20 h) The resulting white solid was collected by filtration dried in vacuum

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of methyl 4-(pentylamino)-1H-imidazole-5-carbimidothioate (0.53 g, 2.4 mmol) and trifluoroacetic acid hydrazide (0.45 g, 3.5 mmol) in ethanol (10 mL) was refluxed overnight. The reaction mixture was concentrated to yield the product as slightly green viscous oil. LCMS calculated for C11H16F3N6(M+H): 289.1. found: 289.1. was refluxed overnight The reaction mixture was concentrated to yield the product as slightly green viscous oil

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of methyl 4-(pentylamino)-1H-imidazole-5-carbimidothioate (0.53 g, 2.4 mmol) and trifluoroacetic acid hydrazide (0.45 g, 3.5 mmol) in ethanol (10 mL) was refluxed overnight. The reaction mixture was concentrated to yield the product as slightly green viscous oil. LCMS calculated for C11H16F3N6(M+H): 289.1. found: 289.1. was refluxed overnight The reaction mixture was concentrated to yield the product as slightly green viscous oil

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of ethyl 2-thioxopiperidine-4-carboxylate (5.7 g, 14.95 mmol) in THF (203 mL) was added 2,2,2-trifluoroacetohydrazide (7.8 g, 60.88 mmol) and Hg(OAc)2 (10.71 g, 33.48 mmol) at ice-water. The mixture was stirred at room temperature for 2 hours and heated at 60° C. for overnight, then filtered. Removed the solvent under reduced pressure and the filtrate was concentrated and purified by silica gel column chromatography (PE/EA=3/1) to afford ethyl 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1,2,4]triazolo[4,3-a]pyridine-7-carboxylate (3.5 g, yield 43.8%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.10-1.32 (m, 3H) 2.16 (br. s., 1H) 2.36 (br. s., 1H) 2.93 (br. s., 1H) 3.02-3.39 (m, 2H) 3.90-4.30 (m, 4H). heated at 60° C. for overnight filtered Removed the solvent under reduced pressure the filtrate was concentrated purified by silica gel column chromatography (PE/EA=3/1)