(3R)-3-methylpiperazin-2-one

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-(chloromethyl)-1-[4-(trifluoromethyl)phenyl]-1H-tetrazole (500 mg, 1.90 mmol, commercially available from UkrOrgSynthesis, Kiev, Ukraine) in acetonitrile (8 mL) was added triethylamine (0.796 mL, 5.71 mmol) and (3R)-3-methyl-2-piperazinone (239 mg, 2.09 mmol, commercially available, for example from Sigma Aldrich, St Louis, USA). The reaction mixture was heated to 120° C. for 20 min.

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

Procedure: The title compound was prepared in analogy to Example 18, using enantiomerically pure 6-[(S)-1-(6-chloro-imidazo[1,2-b]pyridazin-3-yl)-ethyl]-5,7-difluoro-quinoline (Intermediate B, 50 mg, 0.145 mmol) and (R)-3-methyl-piperazin-2-one (33.1 mg, 0.29 mmol) instead of the racemates and flash chromatography for the purification. 2:1 mixture of title compound with compound of Example 60 (tR 3.59 min (conditions 5), tR 8.66 and 10.19 min (conditions 3, 90% n-hexane and 10% isopropanol), MH+=423.1, 1H-NMR in DMSO-d6: 8.91 (m, 1H); 8.42 (d, 1H); 7.90 (s, 1H); 7.80 (d, 1H); 7.69-7.50 (m, 3H); 7.05 (d, 1H); 4.93 (m, 1H); 4.50 and 4.28 (q, 1H); 3.87 (m, 1H); 3.43-2.89 (m, 3H); 1.84 (m, 3H); 1.30 and 0.93 (d, 3H)). for the purification 2:1 mixture of title compound with compound of Example 60 (tR 3.59 min (conditions 5), tR 8.66 and 10.19 min (conditions 3, 90% n-hexane and 10% isopropanol), MH+=423.1, 1H-NMR in DMSO-d6: 8.91 (m, 1H); 8.42 (d, 1H); 7.90 (s, 1H); 7.80 (d, 1H); 7.69-7.50 (m, 3H); 7.05 (d, 1H); 4.93 (m, 1H); 4.50 and 4.28 (q, 1H); 3.87 (m, 1H); 3.43-2.89 (m, 3H); 1.84 (m, 3H); 1.30 and 0.93 (d, 3H))

Conditions: temp:120.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-(chloromethyl)-1-[4-(trifluoromethyl)phenyl]-1H-tetrazole (500 mg, 1.90 mmol, commercially available from UkrOrgSynthesis, Kiev, Ukraine) in acetonitrile (8 mL) was added triethylamine (0.796 mL, 5.71 mmol) and (3R)-3-methyl-2-piperazinone (239 mg, 2.09 mmol, commercially available, for example from Sigma Aldrich, St Louis, USA). The reaction mixture was heated to 120° C. for 20 min.