3-formyl-N-methyl-1H-indole-2-carboxamide

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

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

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: n-Butyllithium (2.5M in hexanes) (48.6 mL, 121.7 mmol) was added dropwise to an ice-cooled solution of methyl triphenylphosphoniumbromide (43.5 g, 121.7 mmol) in THF (500 mL). The mixture was stirred at 0° C. for 1 h then at rt for 2 h. 3-Formyl-N-methyl-1H-indole-2-carboxamide (1.96 g, 9.7 mmol) in THF (100 mL) was added and the mixture stirred at rt for 2 h. The solvent was evaporated and the residue dissolved in ethyl acetate and washed twice with water. The organic phase was dried over magnesium bromide and evaporated in vacuo. The crude mixture was chromatographed over silica gel eluting with 40% ethyl acetate in hexanes to afford the title compound (730 mg (38%). 1H NMR (300 MHz, DMSO-d6) δ 11.48 (s, 1H), 8.04 (s, 1H), 7.92 (d, J=8.0 Hz, 1H), 7.42 (d, J=7.9 Hz, 1H), 7.33 (d, J=18 Hz, 1H), 7.22 (t, J=7.6 Hz, 1H), 7.09 (t, J=7.2 Hz, 1H), 5.77 (d, J=18.4 Hz, 1H), 5.27 (d, J=11.6 Hz, 1H), 2.81 (s, 3H). at rt for 2 h the mixture stirred at rt for 2 h The solvent was evaporated the residue dissolved in ethyl acetate washed twice with water The organic phase was dried over magnesium bromide evaporated in vacuo The crude mixture was chromatographed over silica gel eluting with 40% ethyl acetate in hexanes

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

Procedure: Oxalyl chloride (2.6 mL, 30 mmol) was added drop-wise to an ice-cooled solution of dimethylformamide (34 mL) and dichloromethane (90 mL), then N-methyl-1H-indole-2-carboxamide (3.51 g, 20 mmol) was added and the mixture stirred at rt for 1 h. Water was added and the resulting precipitate filtered, washed with water and diethyl ether. The product was dried to afford the title compound (2.03 g, 50%). 1H NMR (300 MHz, DMSO-d6) δ 12.58 (s, 1H), 10.2 (s, 1H), 9.51 (s, 1H), 8.26 (d, J=7.5 Hz, 1H), 7.66 (d, J=8.6 Hz, 1H), 7.47-7.10 (m, 2H), 2.73 (d, J=4.6 Hz, 3H). the resulting precipitate filtered washed with water and diethyl ether The product was dried

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: n-Butyllithium (2.5M in hexanes) (48.6 mL, 121.7 mmol) was added dropwise to an ice-cooled solution of methyl triphenylphosphoniumbromide (43.5 g, 121.7 mmol) in THF (500 mL). The mixture was stirred at 0° C. for 1 h then at rt for 2 h. 3-Formyl-N-methyl-1H-indole-2-carboxamide (1.96 g, 9.7 mmol) in THF (100 mL) was added and the mixture stirred at rt for 2 h. The solvent was evaporated and the residue dissolved in ethyl acetate and washed twice with water. The organic phase was dried over magnesium bromide and evaporated in vacuo. The crude mixture was chromatographed over silica gel eluting with 40% ethyl acetate in hexanes to afford the title compound (730 mg (38%). 1H NMR (300 MHz, DMSO-d6) δ 11.48 (s, 1H), 8.04 (s, 1H), 7.92 (d, J=8.0 Hz, 1H), 7.42 (d, J=7.9 Hz, 1H), 7.33 (d, J=18 Hz, 1H), 7.22 (t, J=7.6 Hz, 1H), 7.09 (t, J=7.2 Hz, 1H), 5.77 (d, J=18.4 Hz, 1H), 5.27 (d, J=11.6 Hz, 1H), 2.81 (s, 3H). at rt for 2 h the mixture stirred at rt for 2 h The solvent was evaporated the residue dissolved in ethyl acetate washed twice with water The organic phase was dried over magnesium bromide evaporated in vacuo The crude mixture was chromatographed over silica gel eluting with 40% ethyl acetate in hexanes

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

Procedure: Oxalyl chloride (2.6 mL, 30 mmol) was added drop-wise to an ice-cooled solution of dimethylformamide (34 mL) and dichloromethane (90 mL), then N-methyl-1H-indole-2-carboxamide (3.51 g, 20 mmol) was added and the mixture stirred at rt for 1 h. Water was added and the resulting precipitate filtered, washed with water and diethyl ether. The product was dried to afford the title compound (2.03 g, 50%). 1H NMR (300 MHz, DMSO-d6) δ 12.58 (s, 1H), 10.2 (s, 1H), 9.51 (s, 1H), 8.26 (d, J=7.5 Hz, 1H), 7.66 (d, J=8.6 Hz, 1H), 7.47-7.10 (m, 2H), 2.73 (d, J=4.6 Hz, 3H). the resulting precipitate filtered washed with water and diethyl ether The product was dried