2-(cyclopentylamino)acetamide

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

Procedure: To a solution of spiro[isobenzofuran-1(3H),4'-piperidine] (14 g) in dichloromethane (160 ml) triethylamine (11 ml) was added. After cooling to 10° C. a solution of chloroacetylchloride (8 ml) in dichloromethane (10 ml) was added dropwise during 20 minutes. The reaction mixture was finally allowed to reach room temperature. The mixture was subsequently filtered through silica gel (eluted with ethyl acetate/n-heptane 60:40) affording 12 g of the α-chloroacetamide derivative. A mixture of the thus obtained α-chloroacetamide derivative (1.4 g) and cyclopentylamine in MIBK (25 ml) was refluxed for 2 h. The solvent was evaporated in vacuo and the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate. The organic phase was worked up as above yielding 2.0 g of the α-(cyclopentylamino)acetamide derivative as a visceous oil. To a solution of the α-(cyclopentylamino)acetamide derivative (2 g) in MIBK 1-chloracetylspiro[isobenzofuran-1(3H),4'-piperidine] (1.4 g) and potassium carbonate (1 g) were added. The mixture was refluxed for 3 h. After cooling to room-temperature the mixture was filtered through silica gel (eluted with 4% triethylamine in ethyl acetate. Evaporation of the solvents afforded 2.4 g of the diamide which was reduced with LiAlH4 as described in example 1. The title compound 3a crystallized from a mixture of ethanol and acetone (1:4). Yield 1.3 g, mp 258°-260° C. 1H NMR (DMSO-d6) δ 1.50-2.45 (m, 16 H), 3.25-3.80 (m, 17 H), 5.05 (s, 4 H), 7.10-7.40 (m, 8 H). was refluxed for 2 h The solvent was evaporated in vacuo the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate

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

Procedure: To a solution of spiro[isobenzofuran-1(3H),4'-piperidine](14 g) in dichloromethane (160 ml) triethylamine (11 ml) was added. After cooling to 10° C. a solution of chloroacetylchloride (8 ml) in dichloromethane (10 ml) was added dropwise during 20 minutes. The reaction mixture was finally allowed to reach room temperature. the mixture was subsequently filtered through silica gel (eluted with ethyl acetate/n-heptane 60:40) affording 12 g of the α-chloroacetamide derivative. A mixture of the thus obtained α-chloroacetamide derivative (1.4 g) and cyclopentylamine in MIBK (25 ml) was refluxed for 2 h. The solvent was evaporated in vacuo and the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate. The organic phase was worked up as above yielding 2.0 g of the α-(cyclopentylamino)acetamide derivative as a visceous oil. To a solution of the α-(cyclopentylamino)acetamide derivative (2 g) in MIBK 1'-chloracetyl-spiro[isobenzofuran-1(3H),4'-piperidine] (1.4 g) and potassium carbonate (1 g) were added. The mixture was refluxed for 3 h. After cooling to room-temperature the mixture was filtered through silica gel (eluted with 4 % triethylamine in ethyl acetate. Evaporation of the solvents afforded 2.4 g of the diamide which was reduced with LiAlH4 as described in example 1. The title compound 3a crystallized from a mixture of ethanol and acetone (1:4). Yield 1.3 g, mp 258°-260° C. 1H NMR (DMSO-d6)δ1.50-2.45 (m,16 H), 3.25-3.80 (m,17 H), 5.05 (s,4 H), 7.10-7.40 (m,8 H). was refluxed for 2 h The solvent was evaporated in vacuo the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: To a solution of spiro[isobenzofuran-1(3H),4'-piperidine] (14 g) in dichloromethane (160 ml) triethylamine (11 ml) was added. After cooling to 10° C. a solution of chloroacetylchloride (8 ml) in dichloromethane (10 ml) was added dropwise during 20 minutes. The reaction mixture was finally allowed to reach room temperature. The mixture was subsequently filtered through silica gel (eluted with ethyl acetate/n-heptane 60:40) affording 12 g of the α-chloroacetamide derivative. A mixture of the thus obtained α-chloroacetamide derivative (1.4 g) and cyclopentylamine in MIBK (25 ml) was refluxed for 2 h. The solvent was evaporated in vacuo and the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate. The organic phase was worked up as above yielding 2.0 g of the α-(cyclopentylamino)acetamide derivative as a visceous oil. To a solution of the α-(cyclopentylamino)acetamide derivative (2 g) in MIBK 1-chloracetylspiro[isobenzofuran-1(3H),4'-piperidine] (1.4 g) and potassium carbonate (1 g) were added. The mixture was refluxed for 3 h. After cooling to room-temperature the mixture was filtered through silica gel (eluted with 4% triethylamine in ethyl acetate. Evaporation of the solvents afforded 2.4 g of the diamide which was reduced with LiAlH4 as described in example 1. The title compound 3a crystallized from a mixture of ethanol and acetone (1:4). Yield 1.3 g, mp 258°-260° C. 1H NMR (DMSO-d6) δ 1.50-2.45 (m, 16 H), 3.25-3.80 (m, 17 H), 5.05 (s, 4 H), 7.10-7.40 (m, 8 H). was refluxed for 2 h The solvent was evaporated in vacuo the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate

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

Procedure: To a solution of spiro[isobenzofuran-1(3H),4'-piperidine](14 g) in dichloromethane (160 ml) triethylamine (11 ml) was added. After cooling to 10° C. a solution of chloroacetylchloride (8 ml) in dichloromethane (10 ml) was added dropwise during 20 minutes. The reaction mixture was finally allowed to reach room temperature. the mixture was subsequently filtered through silica gel (eluted with ethyl acetate/n-heptane 60:40) affording 12 g of the α-chloroacetamide derivative. A mixture of the thus obtained α-chloroacetamide derivative (1.4 g) and cyclopentylamine in MIBK (25 ml) was refluxed for 2 h. The solvent was evaporated in vacuo and the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate. The organic phase was worked up as above yielding 2.0 g of the α-(cyclopentylamino)acetamide derivative as a visceous oil. To a solution of the α-(cyclopentylamino)acetamide derivative (2 g) in MIBK 1'-chloracetyl-spiro[isobenzofuran-1(3H),4'-piperidine] (1.4 g) and potassium carbonate (1 g) were added. The mixture was refluxed for 3 h. After cooling to room-temperature the mixture was filtered through silica gel (eluted with 4 % triethylamine in ethyl acetate. Evaporation of the solvents afforded 2.4 g of the diamide which was reduced with LiAlH4 as described in example 1. The title compound 3a crystallized from a mixture of ethanol and acetone (1:4). Yield 1.3 g, mp 258°-260° C. 1H NMR (DMSO-d6)δ1.50-2.45 (m,16 H), 3.25-3.80 (m,17 H), 5.05 (s,4 H), 7.10-7.40 (m,8 H). was refluxed for 2 h The solvent was evaporated in vacuo the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: By replacing the p-methylphenylglycine employed in Procedure 14, Step A by an equivalent quantity of cyclopentylglycine, there is obtained cyclopentylglycinamide. Substituting this cyclopentylglycinamide for that employed in Procedure 13 and following the methods described in Steps A and B of Procedure 13, there is obtained in Step A 2-hydroxy-3-cyclopentylpyrazine and in Step B 2-chloro-3-cyclopentylpyrazine.

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

Procedure: To a solution of spiro[isobenzofuran-1(3 H),4'-piperidine] (14 g) in dichloromethane (160 ml) triethylamine (11 ml) was added. After cooling to 10° C. a solution of chloroacetylchloride (8 ml) in dichloromethane (10 ml) was added dropwise during 20 minutes. The reaction mixture was finally allowed to reach room temperature. The mixture was subsequently filtered through silica gel (eluted with ethyl acetate/n-heptane 60:40) affording 12 g of the α-chloroacetamide derivative. A mixture of the thus obtained α-chloroacetamide derivative (1.4 g) and cyclopentylamine in MIBK (25 ml) was refluxed for 2 h. The solvent was evaporated in vacuo and the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate. The organic phase was worked up as above yielding 2.0 g of the α-(cyclopentylamino)acetamide derivative as a visceous oil. To a solution of the α-(cyclopentylamino)acetamide derivative (2 g) in MIBK 1'-chloracetyl-spiro[isobenzofuran-1(3 H),4'-piperidine] (1.4 g) and potassium carbonate (1 g) were added. The mixture was refluxed for 3 h. After cooling to room-temperature the mixture was filtered through silica gel (eluted with 4 % triethylamine in ethyl acetate. Evaporation of the solvents afforded 2.4 g of the diamide which was reduced with LiAlH4 as described in example 1. The title compound 3a crystallized from a mixture of ethanol and acetone (1:4). Yield 1.3 g, mp 258°-260° C. 1H NMR (DMSO-d6) δ1.50-2.45 (m,16 H), 3.25-3.80 (m,17 H), 5.05 (s,4 H), 7.10-7.40 (m, 8 H). was refluxed for 2 h The solvent was evaporated in vacuo the cyclopentylamino derivative was extracted from an alkaline (pH>9) aqueous solution with ethyl acetate