2-(2-amino-5-chlorophenyl)-1,1,1-trifluorobut-3-yn-2-ol

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A THF solution of 2-(2-amino-5-chlorophenyl)-1,1,1-trifluoro-3-butyn-2-ol (5.0 g, 20.0 mmol in 225 mL THF) was treated with 1,1'-carbonyldiimidazole (13.0 g, 80.0 mmol) and heated in an oil bath at 60° C. for 17 h. The THF was removed in vacuo, the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate. Following filtration and evaporation in vacuo the crude product was isolated (3.6 g) and recrystallized from ethyl acetate: hexane. The product (+/-) 6-chloro-4-ethynyl-4-(1,1,1-trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one was isolated as a white crystalline solid (3.22 g, 58.4% yield): mp 226°-227° C. 1H-NMR (CDCl3 +trace DMSO): δ3.16 (s, 1H), 6.98 (d, J=3.3 Hz, 1H), 7.35 (m, 1H), 7.51 (s, 1H), 10.66 (s, 1H). The THF was removed in vacuo the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate filtration and evaporation in vacuo the crude product was isolated (3.6 g) recrystallized from ethyl acetate

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A THF solution of 2-(2-amino-5-chlorophenyl)-1,1,1-trifluoro-3-butyn-2-ol (5.0 g, 20.0 mmol in 225 mL THF) was treated with 1,1'-carbonyldiimidazole (13.0 g, 80.0 mmol) and heated in an oil bath at 60° C. for 17 h. The THF was removed in vacuo, the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate. Following filtration and evaporation in vacuo the crude product was isolated (3.6 g) and recrystallized from ethyl acetate:hexane. The product (+/-) 6-chloro-4-ethynyl-4-(1,1,1-trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one was isolated as a white crystalline solid (3.22 g, 58.4% yield): mp 226°-227° C. 1H-NMR (CDCl3 +trace DMSO): δ 3.16 (s, 1H), 6.98 (d, J=3.3 Hz, 1H), 7.35 (m, 1H), 7.51 (s, 1H), 10.66 (s, 1H). The THF was removed in vacuo the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate filtration and evaporation in vacuo the crude product was isolated (3.6 g) recrystallized from ethyl acetate

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

Procedure: A THF solution of 2-(2-amino-5-chlorophenyl)-1,1,1-trifluoro-3-butyn-2-ol (5.0 g, 20.0 mmol in 225 mL THF) was treated. with 1,1'-carbonyldiimidazole (13.0 g, 80.0 mmol) and heated in an oil bath at 60° C. for 17 h. The THF was removed in vacuo, the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate. Following filtration and evaporation in vacuo the crude product was isolated (3.6 g) and recrystallized from ethyl acetate: hexane. The product (±) 6-chloro-4-ethynyl-4-(1,1,1-trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one was isolated as a white crystalline solid (3.22 g, 58.4% yield): mp 226°-227° C. 1H-NMR (CDCl3 +trace DMSO): δ3.16 (s, 1H), 6.98 (d, J=3.3 Hz, 1H), 7.35 (m, 1H), 7.51 (s, 1H), 10.66 (s, 1H). The THF was removed in vacuo the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate filtration and evaporation in vacuo the crude product was isolated (3.6 g) recrystallized from ethyl acetate

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A THF solution of 2-(2-amino-5-chlorophenyl)-1,1,1-trifluoro-3-butyn-2-ol (5.0 g, 20.0 mmol in 225 mL THF) was treated with 1,1'-carbonyldiimidazole (13.0 g, 80.0 mmol) and heated in an oil bath at 60° C. for 17 h. The THF was removed in yacuo, the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate. Following filtration and evaporation in vacuo the crude product was isolated (3.6 g) and recrystallized from ethyl acetate: hexane. The product (+/-) 6-chloro-4-ethynyl-4-(1,1,1-trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one was isolated as a white crystalline solid (3.22 g, 58.4% yield): mp 226°-227° C. 1H-NMR (CDCl3 +trace DMSO): δ3.16 (s, 1H), 6.98 (d, J=3.3 Hz, 1H), 7.35 (m, 1H), 7.51 (s, 1H), 10.66 (s, 1H). The THF was removed in yacuo the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate filtration and evaporation in vacuo the crude product was isolated (3.6 g) recrystallized from ethyl acetate

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A THF solution of 2-(2-amino-5-chlorophenyl)-1,1,1-trifluoro-3-butyn-2-ol (5.0 g, 20.0 mmol in 225 mL THF) was treated with 1,1'-carbonyldiimidazole (13.0 g, 80.0 mmol) and heated in an oil bath at 60° C. for 17 h. The THF was removed in vacuo, the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate. Following filtration and evaporation in vacuo the crude product was isolated (3.6 g) and recrystallized from ethyl acetate: hexane. The product (+/-) 6-chloro-4-ethynyl-4-(1,1,1-trifluoromethyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one was isolated as a white crystalline solid (3.22 g, 58.4% yield): mp 226°-227° C. 1H-NMR (CDCl3 +trace DMSO): δ3.16 (s, 1H), 6.98 (d, J=3.3 Hz, 1H), 7.35 (m, 1H), 7.51 (s, 1H), 10.66 (s, 1H). The THF was removed in vacuo the residue dissolved in ethyl acetate then washed with 10% citric acid, sodium bicarbonate, water and brine before drying over sodium sulfate filtration and evaporation in vacuo the crude product was isolated (3.6 g) recrystallized from ethyl acetate