methyl 2-bromopentanoate

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

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

Procedure: A mixture of methyl bromovalerate (1.56 g, 8.0 mmol), 4-benzylpiperidine (1.49 g, 8.5 mmol) and potassium carbonate (2.93 g, 21.25 mmol) in 30 mL of acetonitrile was refluxed under N2 for 12 hr. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×30 mL). The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography, giving 1.8 g (78%) of the product as a pale yellow oil. 1H NMR (CHCl3), 1.312 (m, 2 H), 1.505-1.593 (m, 7 H), 1.831 (m, 2 H), 2.292 (m, 4 H), 2.505 (d, J=6.9 Hz, 2H), 2.860 (d, J=11.4 Hz, 2 H), 3.647 (s, 3 H), 7.136 (m, 5 H). was refluxed under N2 for 12 hr The inorganic salt was removed through a short column of silica gel washed with ethyl acetate (3×30 mL) The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography

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

Procedure: A mixture of methyl bromovalerate (1.56 g, 8.0 mmol), 4-benzylpiperidine (1.49 g, 8.5 mmol) and potassium carbonate (2.93 g, 21.25 mmol) in 30 mL of acetonitrile was refluxed under N2 for 12 hr. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×30 mL). The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography, giving 1.8 g (78%) of the product as a pale yellow oil. 1H NMR (CHCl3), 1.312 (m, 2 H), 1.505-1.593 (m, 7 H), 1.831 (m, 2 H), 2.292 (m, 4 H), 2.505 (d, J=6.9 Hz, 2H), 2.860 (d, J=11.4 Hz, 2 H), 3.647 (s, 3 H), 7.136 (m, 5 H). was refluxed under N2 for 12 hr The inorganic salt was removed through a short column of silica gel washed with ethyl acetate (3×30 mL) The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography

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

Procedure: A mixture of methyl bromovalerate (1.56 g, 8.0 mmol), 4-benzylpiperidine (1.49 g, 8.5 mmol) and potassium carbonate (2.93 g, 21.25 mmol) in 30 mL of acetonitrile was refluxed under N2 for 12 hr. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×30 mL). The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography, giving 1.8 g (78%) of the product as a pale yellow oil. 1H NMR (CHCl3), 1.312 (m, 2 H), 1.505-1.593 (m, 7 H), 1.831 (m, 2 H), 2.292 (m, 4 H), 2.505 (d, J=6.9 Hz, 2H), 2.860 (d, J=11.4 Hz, 2 H), 3.647 (s, 3 H), 7.136 (m, 5 H). was refluxed under N2 for 12 hr The inorganic salt was removed through a short column of silica gel washed with ethyl acetate (3×30 mL) The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography

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

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

Procedure: A mixture of methyl bromovalerate (1.56 g, 8.0 mmol), 4-benzylpiperidine (1.49 g, 8.5 mmol) and potassium carbonate (2.93 g, 21.25 mmol) in 30 mL of acetonitrile was refluxed under N2 for 12 hr. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×30 mL). The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography, giving 1.8 g (78%) of the product as a pale yellow oil. 1H NMR (CHCl3), 1.312 (m, 2 H), 1.505-1.593 (m, 7 H), 1.831 (m, 2 H), 2.292 (m, 4 H), 2.505 (d, J=6.9 Hz, 2 H), 2.860 (d, J=11.4 Hz, 2 H), 3.647 (s, 3 H), 7.136 (m, 5 H). was refluxed under N2 for 12 hr The inorganic salt was removed through a short column of silica gel washed with ethyl acetate (3×30 mL) The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography

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

Procedure: A mixture of 0.1 mole of 7-bromo-1,3-dihydro-5-(2-pyridyl)-2H-1,4-benzodiazepin-2-one and 0.11 mole of sodium methoxide in about 200 ml. of dimethylformamide is heated at about 95° c. for about 20 minutes. To the mixture is added a solution of 0.11 mole of methyl 2-bromovalerate in about 200 ml. of toluene over a period of about 1 hour at about 95° C., and heating is continued for an additional period of about 6 hours. The reaction mixture is then evaporated in vacuo and the residue thus obtained is stirred with about 500 ml. of water. The resulting suspension is filtered and the solids thus obtained are crystallized from a suitable organic solvent such as ether, methanol, methylene chloride, methylene chloride-methanol and the like to obtain 7-bromo-2,3-dihydro-2-oxo-α-propyl-5-(2-pyridyl)-1H-1,4-benzodiazepine-1-acetic acid methyl ester. heating is continued for an additional period of about 6 hours The reaction mixture is then evaporated in vacuo the residue thus obtained The resulting suspension is filtered the solids thus obtained are crystallized from a suitable organic solvent such as ether, methanol, methylene chloride, methylene chloride-methanol

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

Procedure: A mixture of methyl bromovalerate (1.56 g, 8.0 mmol), 4-benzylpiperidine (1.49 g, 8.5 mmol) and potassium carbonate (2.93 g, 21.25 mmol) in 30 mL of acetonitrile was refluxed under N2 for 12 hr. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×30 mL). The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography, giving 1.8 g (78%) of the product as a pale yellow oil. 1H NMR (CHCl3), 1.312 (m, 2 H), 1.505-1.593 (m, 7 H), 1.831 (m, 2 H), 2.292 (m, 4 H), 2.505 (d, J=6.9 Hz, 2H), 2.860 (d, J=11.4 Hz, 2 H), 3.647 (s, 3 H), 7.136 (m, 5 H). was refluxed under N2 for 12 hr The inorganic salt was removed through a short column of silica gel washed with ethyl acetate (3×30 mL) The filtrate was evaporated in vacuo to give a residue, which was purified by flash chromatography