2-(4-chlorophenoxy)acetyl chloride

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:

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

Procedure: To a stirred solution of 4-chlorophenoxyacetyl chloride (2 g) in tetrahydrofuran (40 ml) at 0° C. was added methylamine (2M, 12.2 ml). The reaction was allowed to warm to room temperature, and stirred for 1 h, before water (30 ml) added and the tetrahydrofuran removed in vacuo. The aqueous was extracted with ethyl acetate (2×50 ml), the combined organic extracts washed with brine (40 ml), dried over magnesium sulphate (1 g) and the solvent removed in vacuo to yield the title compound as a white solid (1.67 g). added the tetrahydrofuran removed in vacuo The aqueous was extracted with ethyl acetate (2×50 ml) the combined organic extracts washed with brine (40 ml) dried over magnesium sulphate (1 g) the solvent removed in vacuo

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

Procedure: To a stirred solution of 4-chlorophenoxyacetyl chloride (2 g) in tetrahydrofuran (40 ml) at 0° C. was added methylamine (2M, 12.2 ml). The reaction was allowed to warm to room temperature, and stirred for 1 h, before water (30 ml) added and the tetrahydrofuran removed in vacuo. The aqueous was extracted with ethyl acetate (2×50 ml), the combined organic extracts washed with brine (40 ml), dried over magnesium sulphate (1 g) and the solvent removed in vacuo to yield the title compound as a white solid (1.67 g). added the tetrahydrofuran removed in vacuo The aqueous was extracted with ethyl acetate (2×50 ml) the combined organic extracts washed with brine (40 ml) dried over magnesium sulphate (1 g) the solvent removed in vacuo

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

Procedure: To a solution of (2R,5S)-1-(4-fluorobenzyl)-2-(hydroxy)methyl-5-methylpiperazine (1.6 g, 6.7 mmol) in CH2Cl2 (30 mL) was added triethylamine (excess) and 4-chlorophenoxyacetyl chloride (1.5 g, 7.4 mmol, dropwise in 10 mL solution of CH2Cl2). The resultant mixture was stirred at ambient temperature. After 20 minutes, analysis by analytical TLC showed complete consumption of starting material had occurred. The mixture was concentrated of volatiles in vacuo and the residue taken up in CH2Cl2. This was washed with saturated aqueous NaHCO3 solution, then water, then brine, dried over MgSO4, filtered, and concentrated in vacuo. Purification by flash column chromatography on silica gel afforded 2.16 g (79% yield) of (2R,5R)-1-((4-chlorophenoxy)methyl)carbonyl-2-methyl-4-(4-fluorobenzyl)-5-((hydroxy)methyl)piperazine, as a solid yellow foam: NMR (DMSO-d6) 7.7 (br s, 2), 7.3 (m, 4), 6.9 (d, 2), 5.04.2 (m, 5), 4.0-3.2 (m, 7), 1.2 (m, 3) ppm; MS (LSIMS) 406. consumption of starting material The mixture was concentrated of volatiles in vacuo This was washed with saturated aqueous NaHCO3 solution water, then brine, dried over MgSO4 filtered concentrated in vacuo Purification by flash column chromatography on silica gel

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

Procedure: To a solution of (cis)-2,6-dimethylpiperazine (0.115 g, 1.1 mmol) in methanol (35 mL) was added 4-chlorophenoxyacetyl chloride (0.205 g, 1.0 mmol, in solution of 6 mL of anhydrous ether). The resulting mixture was stirred at ambient temperature for 10 minutes and then triethylamine (0.10 mL, 0.72 mmol) was added. After 30 minutes, the mixture was concentrated in vacuo to afford an oily residue. This was taken up in ether and washed with saturated aqueous NaHCO3 solution, then brine. The organic layer was separated, dried over MgSO4, filtered and concentrated in vacuo to afford an oil. Purification by flash column chromatography afforded 0.202 g (80% yield) of (cis)-1-((4-chlorophenoxy)methyl)carbonyl-3,5-dimethylpiperazine, a compound of formula (K), as a clear, colorless oil; NMR (CDCl3) 7.3 (d, 2), 6.9 (d, 2), 4.7 (d,1), 4.6 (d,1), 4.4 (d,1), 3.8 (d,1), 2.7 (m, 3), 2.2 (t, 1), 1.1 (m, 6) ppm. After 30 minutes the mixture was concentrated in vacuo to afford an oily residue washed with saturated aqueous NaHCO3 solution The organic layer was separated dried over MgSO4 filtered concentrated in vacuo to afford an oil Purification by flash column chromatography

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

Procedure: To a solution of diethyl 2-methyl-4-(2-nitrophenyl)-6-hydroxymethyl-1,4-dihydropyridine-3,5-dicarboxylate (1.95 g) in pyridine (25 ml) was dropwise added over 5 minutes a solution of p-chlorophenoxyacetyl chloride (3.07 g) in methylene chloride under stirring and ice-cooling. The resultant mixture was stirred overnight under cooling with water at 20° C. After removal of the pyridine, water was added to the residue. The precipitated oily substance was extracted with ethyl acetate. The extract was adjusted to pH 4 to 5 with dil. hydrochloric acid, washed each three times with water and then an aqueous solution of sodium bicarbonate and dried over magnesium sulfate. The solvent was distilled off and the residual oil (4.75 g) was subjected to column chromatography on silica-gel using an eluent (benzene:ethyl acetate=10:1) to give an oil (2.65 g) of diethyl 2-methyl-4-(2-nitrophenyl)-6-(4-chlorophenoxy)acetoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate, m.p. 86° to 88° C. (recrystallized from a mixture of diisopropylether and ethanol). ice-cooling After removal of the pyridine, water was added to the residue The precipitated oily substance was extracted with ethyl acetate washed each three times with water an aqueous solution of sodium bicarbonate and dried over magnesium sulfate The solvent was distilled off