ethyl 2-oxo-2-(propan-2-ylamino)acetate

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a vial containing ethyl(isopropylcarbamoyl)formate (160 mg, 1.0 mmol) was added thionyl chloride (1.0 mL, 13.8 mmol). The vial was capped with a teflon coated septa and heated to 80° C. for 5 h. After cooling to room temperature, the volatiles were removed in vacuo. A solution of 4-chloro-N-(5-chloro-2-(hydrazinecarbonyl)pyridine-3-yl)-3-(trifluoromethyl)benzenesulfonamide (342 mg, 0.80 mmol) in toluene (3 mL) was added. The mixture was stirred at 40° C. for 16 h. After cooling to room temperature, the toluene was removed in vacuo. Ethanol (9 mL) and triethylamine (1 mL) were added, and the solution heated to 90° C. for 4 h. After cooling to room temperature, the volatiles were removed in vacuo, and the resulting residue purified by flash chromatography on 4 g of silica gel (0→20% gradient of MeOH in DCM). The pure fractions were collected, and the solvent removed in vacuo to afford the title compound (14 mg, 3% yield). HPLC retention time=3.17 minutes. 1H NMR (400 MHz, CDCl3) δ 8.39 (d, J=2.4, 1H), 8.19 (d, J=2.4, 1H), 8.04 (d, J=2.4, 1H), 7.89 (dd, J=2.0, 8.4, 1H), 7.53 (d, J=8.0, 1H), 5.66 (sept, J=7.0, 1H), 4.52 (q, J=7.4, 2H), 1.52 (d, J=7.0, 6H), 1.50 (t, J=7.4, 3H). MS (ES) [M+H]+ expected 552.0, found 552.0. After cooling to room temperature the volatiles were removed in vacuo After cooling to room temperature the toluene was removed in vacuo Ethanol (9 mL) and triethylamine (1 mL) were added the solution heated to 90° C. for 4 h After cooling to room temperature the volatiles were removed in vacuo the resulting residue purified by flash chromatography on 4 g of silica gel (0→20% gradient of MeOH in DCM) The pure fractions were collected the solvent removed in vacuo

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a vial containing ethyl(isopropylcarbamoyl)formate (160 mg, 1.0 mmol) was added thionyl chloride (1.0 mL, 13.8 mmol). The vial was capped with a teflon coated septa and heated to 80° C. for 5 h. After cooling to room temperature, the volatiles were removed in vacuo. A solution of 4-chloro-N-(5-chloro-2-(hydrazinecarbonyl)pyridine-3-yl)-3-(trifluoromethyl)benzenesulfonamide (342 mg, 0.80 mmol) in toluene (3 mL) was added. The mixture was stirred at 40° C. for 16 h. After cooling to room temperature, the toluene was removed in vacuo. Ethanol (9 mL) and triethylamine (1 mL) were added, and the solution heated to 90° C. for 4 h. After cooling to room temperature, the volatiles were removed in vacuo, and the resulting residue purified by flash chromatography on 4 g of silica gel (0→20% gradient of MeOH in DCM). The pure fractions were collected, and the solvent removed in vacuo to afford the title compound (14 mg, 3% yield). HPLC retention time=3.17 minutes. 1H NMR (400 MHz, CDCl3) δ 8.39 (d, J=2.4, 1H), 8.19 (d, J=2.4, 1H), 8.04 (d, J=2.4, 1H), 7.89 (dd, J=2.0, 8.4, 1H), 7.53 (d, J=8.0, 1H), 5.66 (sept, J=7.0, 1H), 4.52 (q, J=7.4, 2H), 1.52 (d, J=7.0, 6H), 1.50 (t, J=7.4, 3H). MS (ES) [M+H]+ expected 552.0, found 552.0. After cooling to room temperature the volatiles were removed in vacuo After cooling to room temperature the toluene was removed in vacuo Ethanol (9 mL) and triethylamine (1 mL) were added the solution heated to 90° C. for 4 h After cooling to room temperature the volatiles were removed in vacuo the resulting residue purified by flash chromatography on 4 g of silica gel (0→20% gradient of MeOH in DCM) The pure fractions were collected the solvent removed in vacuo