2-(4-aminophenyl)-N,N-dimethylacetamide

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

Procedure: A suspension of 4-aminophenylacetic acid (5 g, 30 mmol), 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride (6.9 g, 36 mmol), and dimethylamine (6.5 mol of a 5.6M solution in EtOH 36 mmol) in 1,2, DCE was stirred at room temperature for 4 h. Silica was added, the suspension evaporated and residue loaded onto silica plug column, eluting with DCM:MeOH/98:2). The title compound (2.6 g, 45%) was isolated as an orange solid. 1H MNR (400 MHz, CDCl3) δ2.94 (3H, s), δ2.98 (3H, s), 3.60 (2H, s), 6.64 (2H, d, J=8.3 Hz), 7.03 (2H, d, 8.2 Hz). MS (CI)+179 (M+H)+. Silica was added the suspension evaporated eluting with DCM

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

Procedure: An ice cold solution of sodium nitrite (1.088 g) in water (6 ml) was added to a stirred solution of 2-(4-aminophenyl)-N,N-dimethylacetamide (2.67 g) in concentrated hydrochloric acid (10 ml) at -5° C. After stirring the yellow solid for 15 min, it was added to a stirred solution of stannous chloride (16.88 g) in concentrated hydrochloric acid (10 ml) at -10° C. When the addition was complete, the mixture was stirred at room temperature for a further 30 min and poured into ethanol (100 ml). The mixture was evaporated to dryness under reduced pressure, basified using 2N sodium hydroxide (350 ml) and extracted with ethyl acetate (3×200 ml). Evaporation of the dried (Na2SO4) solvent gave a pale yellow gum which was dried under high vacuum. This was dissolved in ethyl acetate (50 ml) and ethereal hydrogen chloride was added until no more solid deposited. Collection of the solid by filtration and washing with ether gave the title compound as a white powder (1.45 g) which was 82.6% pure and was used in the next stage without further purification. When the addition the mixture was stirred at room temperature for a further 30 min The mixture was evaporated to dryness under reduced pressure extracted with ethyl acetate (3×200 ml) Evaporation of the dried (Na2SO4) solvent gave a pale yellow gum which was dried under high vacuum This was dissolved in ethyl acetate (50 ml) ethereal hydrogen chloride was added until no more solid Collection of the solid by filtration washing with ether

Conditions: temp:150.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-chloro-2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridine hydrochloride (0.100 g, 0.33 mmol) and 2-(4-aminophenyl)-N,N-dimethylacetamide (0.178 g, 1.0 mmol) was heated for 3 h at 150° C., then toluene added and the mixture continued heating for an additional 7 h. After this time, the mixture was purified by silica gel chromatography eluting with methylene chloride and methanol. The resulting solid was converted to the HCl salt to afford the title compound (0.048 g, 33%) as a white solid. MW=405.92. 1H NMR (DMSO-d6, 500 MHz) δ 14.2 (br s, 1H), 9.88 (s, 1H), 7.91-7.90 (m, 1H), 7.72-7.66 (m, 2H), 7.61-7.58 (m, 1H), 7.37-7.32 (m, 1H), 7.01 (s, 1H), 3.73 (s, 2H), 3.17 (t, J=7.7 Hz, 2H), 3.04 (s, 3H), 2.93 (t, J=7.2 Hz, 2H), 2.84 (s, 3H), 2.27-2.21 (m, 2H); ESI MS m/z 406 [M+H]+. the mixture continued heating for an additional 7 h After this time, the mixture was purified by silica gel chromatography eluting with methylene chloride and methanol