methyl 3-(cyclopentylamino)propanoate

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: Methyl 3-(cyclopentylamino)propanoate (0.838 g, 0.005 mol, 1 eq) and K2CO3 (0.676 g, 0.005 mol, 1 eq) were added to acetone (5 mL) and the resulting mixture cooled to 0° C. before the dropwise addition of 2,4-dichloro-5-nitropyrimidine (1.04 g, 0.0055 mol, 1.1 eq). The reaction mixture (RM) was warmed to rt and stirring continued for an additional 16 h before the addition of a further 0.12 eq of the pyrimidine. Stirring continued for a further 3 h. The RM was evaporated under reduced pressure and the product extracted using EtOAc/H2O. The organic extracts were washed with sat NaCl, dried (MgSO4) and evaporated under reduced pressure to give the product as a brown oily residue (1.04 g, 65%); MS+ve: 329.2; Rt=3.78 min (Analytical—1). Stirring The RM was evaporated under reduced pressure the product extracted The organic extracts were washed with sat NaCl dried (MgSO4) evaporated under reduced pressure

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

Procedure: Methyl 3-aminopropanoate (9.37 g, 0.09 mol) was dissolved in DCM (200 mL). Cyclopentanone (6.43 mL, 0.07 mol, 0.77 eq), sodium acetate (5.96 g, 0.07 mol, 0.77 eq) and sodium triacetoxyborohydride (22 g, 0.10 mol, 1.11 eq) were added then the reaction was stirred at rt for 16 h. 20% Sodium bicarbonate (100 mL) and 2 M sodium hydroxide (50 mL) were added and the product extracted using DCM/H2O. The organic extracts were combined, washed with sat. NaCl, dried (MgSO4) and evaporated under reduced pressure to give the product as a pale yellow oil (8.90 g, 55%); MS+ve: 172.4. the product extracted washed with sat. NaCl dried (MgSO4) evaporated under reduced pressure

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

Procedure: Methyl 3-aminopropanoate (9.37 g, 0.09 mol) was dissolved in DCM (200 mL). Cyclopentanone (6.43 mL, 0.07 mol, 0.77 eq), sodium acetate (5.96 g, 0.07 mol, 0.77 eq) and sodium triacetoxyborohydride (22 g, 0.10 mol, 1.11 eq) were added then the reaction was stirred at rt for 16 h. 20% Sodium bicarbonate (100 mL) and 2 M sodium hydroxide (50 mL) were added and the product extracted using DCM/H2O. The organic extracts were combined, washed with sat. NaCl, dried (MgSO4) and evaporated under reduced pressure to give the product as a pale yellow oil (8.90 g, 55%); MS+ve: 172.4. the product extracted washed with sat. NaCl dried (MgSO4) evaporated under reduced pressure

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 3-(cyclopentylamino)propanoate (838 mg, 0.005 mol) and K2CO3 (676 mg, 0.005 mol) were added to acetone (5 ml) and the resulting mixture cooled to 0° C. using an ice-bath before the addition of 2,4-dichloro-5-nitropyrimidine (1.044 g, 1.1 eq). The reaction mixture (RM) was then warmed to rt and stirring continued for an additional 16 h before the addition of a further 0.12 eq of the pyrimidine. Stirring was then continued for a further 3 h. The RM was then evaporated under reduced pressure and the product extracted using EtOAc/H2O. The organic extracts were combined, washed with sat NaCl, dried using MgSO4, filtered and the filtrate evaporated under reduced pressure and further dried in vacuo to give the product as a brown oily residue (1.04 g, 65%); Rt=16 min (Vydac 1); ME+ve: 329.1. The reaction mixture (RM) was then warmed to rt Stirring The RM was then evaporated under reduced pressure the product extracted washed with sat NaCl dried filtered the filtrate evaporated under reduced pressure further dried in vacuo

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Methyl 3-(cyclopentylamino)propanoate (838 mg, 0.005 mol) and K2CO3 (676 mg, 0.005 mol) were added to acetone (5 ml) and the resulting mixture cooled to 0° C. using an ice-bath before the addition of 2,4-dichloro-5-nitropyrimidine (1.044 g, 1.1 eq). The reaction mixture (RM) was then warmed to rt and stirring continued for an additional 16 h before the addition of a further 0.12 eq of the pyrimidine. Stirring was then continued for a further 3 h. The RM was then evaporated under reduced pressure and the product extracted using EtOAc/H2O. The organic extracts were combined, washed with sat NaCl, dried using MgSO4, filtered and the filtrate evaporated under reduced pressure and further dried in vacuo to give the product as a brown oily residue (1.04 g, 65%); Rt=16 min (Vydac 1); ME+ve: 329.1. The reaction mixture (RM) was then warmed to rt Stirring The RM was then evaporated under reduced pressure the product extracted washed with sat NaCl dried filtered the filtrate evaporated under reduced pressure further dried in vacuo

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

Procedure: Methyl 3-aminopropanoate (9.37 g, 0.09 mol) was solubilised in DCM (200 ml) and cyclopentanone (6.43 ml, 0.07 mol), sodium acetate (5.96 g, 0.07 mol) and sodium triacetoxyborohydride (22 g, 0.10 mol) were added. The reaction was stirred at rt for 16 h. 20% sodium bicarbonate (100 ml) and 2M sodium hydroxide (50 ml) were then added and the product extracted using DCM/H2O. The organic extracts were combined, washed with sat NaCl, dried using MgSO4, filtered and the filtrate evaporated under reduced pressure and further dried in vacuo to give the product as a pale yellow oil (8.90 g, 55%); MS+ve: 172.4. the product extracted washed with sat NaCl dried filtered the filtrate evaporated under reduced pressure further dried in vacuo

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

Procedure: Methyl 3-(cyclopentylamino)propanoate (1.78 g, 10.4 m mole) and potassium carbonate (1.52 g, 11.0 m mol) in acetone (25 ml) was stirred at 0° C. during the addition of a solution of 2,4-dichloro-5-nitropyrimidine (2.04 g, 10.4 m mol) in acetone (15 ml). The mixture was stirred at ambient temperature overnight, concentrated and diluted with ethyl acetate/water. The mixture was extracted ×3 with ethyl acetate, dried over magnesium sulphate and concentrated to an amber oil which solidified on standing. Flash chromatography on silica gel eluting with 30% ethyl acetate/petrol gave methyl 3-(N-cyclopentyl-N-(2-methyl-5-nitropyrimidin-4-yl)amino)propionate as a pale yellow solid (2.24 g, 65%). NMR CDCl3 1.50-2.07 (8H, m), 2.70-2.82 (2H, m), 3.65-3.90 (6H, m), 8.72 (1H, s). concentrated diluted with ethyl acetate/water The mixture was extracted ×3 with ethyl acetate dried over magnesium sulphate concentrated to an amber oil which

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

Procedure: Methyl 3-(cyclopentylamino)propanoate (1.78 g, 10.4 m mole) and potassium carbonate (1.52 g, 11.0 m mol) in acetone (25 ml) was stirred at 0° C. during the addition of a solution of 2,4-dichloro-5-nitropyrimidine (2.04 g, 10.4 m mol) in acetone (15 ml). The mixture was stirred at ambient temperature overnight, concentrated and diluted with ethyl acetate/water. The mixture was extracted ×3 with ethyl acetate, dried over magnesium sulphate and concentrated to an amber oil which solidified on standing. Flash chromatography on silica gel eluting with 30% ethyl acetate/petrol gave methyl 3-(N-cyclopentyl-N-(2-methyl-5-nitropyrimidin-4-yl)amino)propionate as a pale yellow solid (2.24 g, 65%). NMR CDCl3 1.50-2.07 (8H, m), 2.70-2.82 (2H, m), 3.65-3.90 (6H, m), 8.72 (1H, s). concentrated diluted with ethyl acetate/water The mixture was extracted ×3 with ethyl acetate dried over magnesium sulphate concentrated to an amber oil which

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

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

Procedure: Methyl 3-(cyclopentylamino)propanoate (0.838 g, 0.005 mol, 1 eq) and K2CO3 (0.676 g, 0.005 mol, 1 eq) were added to acetone (5 mL) and the resulting mixture cooled to 0° C. before the dropwise addition of 2,4-dichloro-5-nitropyrimidine (1.04 g, 0.0055 mol, 1.1 eq). The reaction mixture (RM) was warmed to rt and stirring continued for an additional 16h before the addition of a further 0.12 eq of the pyrimidine. Stirring continued for a further 3h. The RM was evaporated under reduced pressure and the product extracted using EtOAc/H2O. The organic extracts were washed with sat NaCl, dried (MgSO4) and evaporated under reduced pressure to give the product as a brown oily residue (1.04 g, 65%); MS+ve: 329.2; Rt=3.78 min (Analytical—1). Stirring The RM was evaporated under reduced pressure the product extracted The organic extracts were washed with sat NaCl dried (MgSO4) evaporated under reduced pressure