1-amino-3-(2,2,2-trifluoroethyl)thiourea

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

Procedure: A solution of 3-iodo-1-tosyl-1H-indole-5-carboxylic acid (1.996 g, 4.52 mmol), N-(2,2,2-trifluoroethyl)hydrazinecarbothioamide (0.783 g, 4.52 mmol), and N1-((ethylimino)methylene)-N3,N3-dimethylpropane-1,3-diamine hydrochloride (2.60 g, 13.57 mmol) (Sigma-Aldrich) in DMF (8.0 mL) was heated at 80° C. for 21.25 h, then at 90° C. for 24 h. The solution was cooled to RT. H2O was added and the solution was extracted with EtOAc (3×75 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated to give the crude material. The crude material was purified by flash chromatography (10-60% EtOAc in Hex). The fractions were combined and DCM was added to the residue. A solid was present and was removed by filtration to give 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(2,2,2-trifluoroethyl)-1,3,4-oxadiazol-2-amine (180 mg, 0.320 mmol, 7.08%) as an off white solid. MS (ESI, pos. ion) m/z: 562.9 (M+1). 1H NMR (400 MHz, DMSO-d6) δ ppm 8.65 (t, J=6.6 Hz, 1H), 8.21 (s, 1H), 8.10-8.16 (m, 1H), 7.89-7.99 (m, 3H), 7.73 (s, 1H), 7.43 (d, J=8.2 Hz, 2H), 4.06-4.20 (m, 2H), 2.33 (s, 3H). the solution was extracted with EtOAc (3×75 mL) The combined organic layers were washed with brine dried over MgSO4 filtered concentrated to give the crude material The crude material was purified by flash chromatography (10-60% EtOAc in Hex) DCM was added to the residue was removed by filtration

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

Procedure: A solution of 3-iodo-1-tosyl-1H-indole-5-carboxylic acid (1.996 g, 4.52 mmol), N-(2,2,2-trifluoroethyl)hydrazinecarbothioamide (0.783 g, 4.52 mmol), and N1-((ethylimino)methylene)-N3,N3-dimethylpropane-1,3-diamine hydrochloride (2.60 g, 13.57 mmol) (Sigma-Aldrich) in DMF (8.0 mL) was heated at 80° C. for 21.25 h, then at 90° C. for 24 h. The solution was cooled to RT. H2O was added and the solution was extracted with EtOAc (3×75 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated to give the crude material. The crude material was purified by flash chromatography (10-60% EtOAc in Hex). The fractions were combined and DCM was added to the residue. A solid was present and was removed by filtration to give 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(2,2,2-trifluoroethyl)-1,3,4-oxadiazol-2-amine (180 mg, 0.320 mmol, 7.08%) as an off white solid. MS (ESI, pos. ion) m/z: 562.9 (M+1). 1H NMR (400 MHz, DMSO-d6) δ ppm 8.65 (t, J=6.6 Hz, 1H), 8.21 (s, 1H), 8.10-8.16 (m, 1H), 7.89-7.99 (m, 3H), 7.73 (s, 1H), 7.43 (d, J=8.2 Hz, 2H), 4.06-4.20 (m, 2H), 2.33 (s, 3H). the solution was extracted with EtOAc (3×75 mL) The combined organic layers were washed with brine dried over MgSO4 filtered concentrated to give the crude material The crude material was purified by flash chromatography (10-60% EtOAc in Hex) DCM was added to the residue was removed by filtration

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

Procedure: Anhydrous hydrazine (0.634 mL, 20.20 mmol) (Sigma-Aldrich) was added to a stirring solution of 1,1,1-trifluoro-2-isothiocyanatoethane (2.85 g, 20.20 mmol) in EtOH (80 mL). The reaction was stirred at RT for 2 h. The solvent was removed in vacuo to give N-(2,2,2-trifluoroethyl)hydrazinecarbothioamide, and the material was used without purification. The solvent was removed in vacuo

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

Procedure: A solution of 3-iodo-1-tosyl-1H-indole-5-carboxylic acid (1.996 g, 4.52 mmol), N-(2,2,2-trifluoroethyl)hydrazinecarbothioamide (0.783 g, 4.52 mmol), and N1-((ethylimino)methylene)-N3,N3-dimethylpropane-1,3-diamine hydrochloride (2.60 g, 13.57 mmol) (Sigma-Aldrich) in DMF (8.0 mL) was heated at 80° C. for 21.25 h, then at 90° C. for 24 h. The solution was cooled to RT. H2O was added and the solution was extracted with EtOAc (3×75 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated to give the crude material. The crude material was purified by flash chromatography (10-60% EtOAc in Hex). The fractions were combined and DCM was added to the residue. A solid was present and was removed by filtration to give 5-(3-iodo-1-tosyl-1H-indol-5-yl)-N-(2,2,2-trifluoroethyl)-1,3,4-oxadiazol-2-amine (180 mg, 0.320 mmol, 7.08%) as an off white solid. MS (ESI, pos. ion) m/z: 562.9 (M+1). 1H NMR (400 MHz, DMSO-d6) δ ppm 8.65 (t, J=6.6 Hz, 1H), 8.21 (s, 1H), 8.10-8.16 (m, 1H), 7.89-7.99 (m, 3H), 7.73 (s, 1H), 7.43 (d, J=8.2 Hz, 2H), 4.06-4.20 (m, 2H), 2.33 (s, 3H). the solution was extracted with EtOAc (3×75 mL) The combined organic layers were washed with brine dried over MgSO4 filtered concentrated to give the crude material The crude material was purified by flash chromatography (10-60% EtOAc in Hex) DCM was added to the residue was removed by filtration

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

Procedure: Anhydrous hydrazine (0.634 mL, 20.20 mmol) (Sigma-Aldrich) was added to a stirring solution of 1,1,1-trifluoro-2-isothiocyanatoethane (2.85 g, 20.20 mmol) in EtOH (80 mL). The reaction was stirred at RT for 2 h. The solvent was removed in vacuo to give N-(2,2,2-trifluoroethyl)hydrazinecarbothioamide, and the material was used without purification. The solvent was removed in vacuo