3,4-difluorobenzene-1,2-diamine

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

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

Procedure: 3,4-Difluorobenzene-1,2-diamine (4.6 g, 31.6 mmol) and ethyl oxoacetate (50 wt % in toluene, 13.0 mL, 63.2 mmol) were reacted as described for Intermediate 152 to give 3.7 g of product as an off white solid, mixture with 30% of the regioisomer 5,6-difluoroquinoxalin-2(1H)-one. The mixture was carried on to the next step.

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

Procedure: 3,4-Difluorobenzene-1,2-diamine (4.6 g, 31.6 mmol) and ethyl oxoacetate (50 wt % in toluene, 13.0 mL, 63.2 mmol) were reacted as described for Intermediate 152 to give 3.7 g of product as an off white solid, mixture with 30% of the regioisomer 5,6-difluoroquinoxalin-2(1H)-one. The mixture was carried on to the next step.

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

Procedure: To a 130 mL DMF solution of [(tert-butoxycarbonyl)amino]acetic acid (14.1 g, 80.4 mmol) were added EDC (18.8 g, 96.2 mmol), HOBt (13.1 g, 96.2 mmol), 3,4-difluoro-benzene-1,2-diamine (11.2 g, 77.7 mmol) and N,N-diisopropylethylamine (27.1 mL, 156 mmol). The reaction mixture was stirred at room temperature for 6 hr. The resulting suspension was filtered and the filtrate was diluted with EtOAc, washed with sat. ammonium chloride aq., sat. sodium bicarbonate aq. and brine, dried over anhydrous Na2SO4 filtered and concentrated to give the title compound as crude solid product (24 g). LC/MS: m/z 302(M+H). The resulting suspension was filtered the filtrate was diluted with EtOAc washed with sat. ammonium chloride aq., sat. sodium bicarbonate aq. and brine dried over anhydrous Na2SO4 filtered concentrated

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

Procedure: To a 130 mL DMF solution of [(tert-butoxycarbonyl)amino]acetic acid (14.1 g, 80.4 mmol) were added EDC (18.8 g, 96.2 mmol), HOBt (13.1 g, 96.2 mmol), 3,4-difluoro-benzene-1,2-diamine (11.2 g, 77.7 mmol) and N,N-diisopropylethylamine (27.1 mL, 156 mmol). The reaction mixture was stirred at room temperature for 6 hr. The resulting suspension was filtered and the filtrate was diluted with EtOAc, washed with sat. ammonium chloride aq., sat. sodium bicarbonate aq. and brine, dried over anhydrous Na2SO4 filtered and concentrated to give the title compound as crude solid product (24 g). LC/MS: m/z 302(M+H). The resulting suspension was filtered the filtrate was diluted with EtOAc washed with sat. ammonium chloride aq., sat. sodium bicarbonate aq. and brine dried over anhydrous Na2SO4 filtered concentrated

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (Beckett et al, J. Med. Chem., 563, 1969) (6.72 g, 28 mmol) and 3,4-difluoro-benzene-1,2-diamine (4.00 g, 28 mmol) in polyphosphoric acid (130 g) was heated at 140° C. for 7.5 h. The cooled reaction mixture was poured onto excess solid potassium carbonate and crushed ice. The resulting basic, aqueous solution was extracted with ethyl acetate (2×) and the combined organics were washed with brine, dried (Na2SO4) and the solvent removed in vacuo. The residue was triturated with diethyl ether, ethyl acetate and pentane to afford the title compound as a white solid (4.29 g, 62%). The cooled reaction mixture crushed ice The resulting basic, aqueous solution was extracted with ethyl acetate (2×) the combined organics were washed with brine dried (Na2SO4) the solvent removed in vacuo The residue was triturated with diethyl ether, ethyl acetate and pentane

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

Procedure: 3,4-Difluorobenzene-1,2-diamine (4.6 g, 31.6 mmol) and ethyl oxoacetate (50 wt % in toluene, 13.0 mL, 63.2 mmol) were reacted as described for Intermediate 152 to give 3.7 g of product as an off white solid, mixture with 30% of the regioisomer 5,6-difluoroquinoxalin-2(1H)-one. The mixture was carried on to the next step.

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

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (Beckett et al, J. Med. Chem., 563,1969) (6.72 g, 28 mmol) and 3,4-difluoro-benzene-1,2-diamine (4.00 g, 28 mmol) in polyphosphoric acid (130 g) was heated at 140° C. for 7.5 h. The cooled reaction mixture was poured onto excess solid potassium carbonate and crushed ice. The resulting basic, aqueous solution was extracted with ethyl acetate (2×) and the combined organics were washed with brine, dried (Na2SO4) and the solvent removed in vacuo. The residue was triturated with diethyl ether, ethyl acetate and pentane to afford the title compound as a white solid (4.29 g, 62%). The cooled reaction mixture crushed ice The resulting basic, aqueous solution was extracted with ethyl acetate (2×) the combined organics were washed with brine dried (Na2SO4) the solvent removed in vacuo The residue was triturated with diethyl ether, ethyl acetate and pentane

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (Beckett et al, J. Med. Chem., 563, 1969) (6.72 g, 28 mmol) and 3,4-difluoro-benzene-1,2-diamine (4.00 g, 28 mmol) in polyphosphoric acid (130 g) was heated at 140° C. for 7.5 h. The cooled reaction mixture was poured onto excess solid potassium carbonate and crushed ice. The resulting basic, aqueous solution was extracted with ethyl acetate (2×) and the combined organics were washed with brine, dried (Na2SO4) and the solvent removed in vacuo. The residue was triturated with diethyl ether, ethyl acetate and pentane to afford the title compound as a white solid (4.29 g, 62%). The cooled reaction mixture crushed ice The resulting basic, aqueous solution was extracted with ethyl acetate (2×) the combined organics were washed with brine dried (Na2SO4) the solvent removed in vacuo The residue was triturated with diethyl ether, ethyl acetate and pentane

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (Beckett et al, J. Med. Chem., 563, 1969) (6.72 g, 28 mmol) and 3,4-difluoro-benzene-1,2-diamine (4.00 g, 28 mmol) in polyphosphoric acid (130 g) was heated at 140° C. for 7.5 h. The cooled reaction mixture was poured onto excess solid potassium carbonate and crushed ice. The resulting basic, aqueous solution was extracted with ethyl acetate (2×) and the combined organics were washed with brine, dried (Na2SO4) and the solvent removed in vacuo. The residue was triturated with diethyl ether, ethyl acetate and pentane to afford the title compound as a white solid (4.29 g, 62%). The cooled reaction mixture crushed ice The resulting basic, aqueous solution was extracted with ethyl acetate (2×) the combined organics were washed with brine dried (Na2SO4) the solvent removed in vacuo The residue was triturated with diethyl ether, ethyl acetate and pentane

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1 g of 3,4-difluoro-1,2-phenylenediamine (6.94 mmol) and 0.983 g of chloro-acetic acid (10.41 mmol, 1.5 eq) in 13 mL of 4N aqueous HCl was heated to 100° C. for 3 h. The mixture was poured onto ice (10 g), neutralized by the addition of NH4OH and extracted with three 30 mL portions of ethyl acetate. The organic extracts were combined and dried over Na2SO4, filtered and concentrated by rotary evaporation to give 1.28 g of 2-chloromethyl-5,6-difluoro-1H-benzoimidazole as a brown solid. 1H NMR (300 MHz, CDCl3/CD3OD): δ 7.30-7.25 (m, 2H), 4.68 (s, 2H); MS (ESI): Calcd m/z for C8H5ClF2N2.H+=203.1. Found m/z=203.2/205.2 [(M+1)+/(M+3)+]. The mixture was poured onto ice (10 g) extracted with three 30 mL portions of ethyl acetate dried over Na2SO4 filtered concentrated by rotary evaporation