2-[1-[(2-methylpropan-2-yl)oxycarbonyl]piperidin-2-yl]acetic acid

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

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

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

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

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

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

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

Procedure: (RS)-2-Carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (1.93 g) was heated with 1,2-diamino-3-fluorobenzene (1.00 g) (Kirk, K. L, J. Org. Chem., 1969, 34, 384) as described in Description 18 to afford the title compound (1.14 g).

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

Procedure: (RS)-2-Carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (1.93 g) was heated with 1,2-diamino-3-fluorobenzene (1.00 g) (Kirk, K. L, J. Org. Chem., 1969, 34, 384) as described in Description 18 to afford the title compound (1.14 g).

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

Procedure: The title compound was prepared using the method of Description 18 from 3-bromobenzene-1,2-diamine (0.50 g, 2.7 mmol) and 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (0.65 g, 2.7 mmol), as a pale brown amorphous solid (0.70 g, 88%)

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

Procedure: The title compound was prepared using the method of Description 18 from 3-bromobenzene-1,2-diamine (0.50 g, 2.7 mmol) and 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (0.65 g, 2.7 mmol), as a pale brown amorphous solid (0.70 g, 88%)

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

Procedure: A solution of 2-carboxymethyl-piperidine-1-carboxylic acid tert-butyl ester (Beckett et al, J. Med. Chem., 563, 1969) (2.29 g, 10 mmol) in DMF (20 ml) was treated sequentially with N,N-diisopropylethylamine (4.0 ml), HATU (3.8 g, 10 mmol) and O,N-dimethyl-hydroxylamine.HCl (0.98 g, 10 mmol). The reaction mixture was stirred under argon at room temperature for 16 h. The volatiles were removed in vacuo and the residue was chromatographed (silica gel, diethyl ether) to afford the title compound as a white solid (2.60 g, 90%). The volatiles were removed in vacuo the residue was chromatographed (silica gel, diethyl ether)

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