[Cl:1][C:2]1[CH:15]=[CH:14][C:5]([CH2:6][N:7]2[CH2:12][CH2:11][CH:10]([NH2:13])[CH2:9][CH2:8]2)=[CH:4][CH:3]=1.[Cl:16][C:17]1[N:18]=[N:19][C:20](Cl)=[CH:21][CH:22]=1.C(=O)([O-])[O-].[Na+].[Na+]>CC(N(C)C)=O.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:6][N:7]2[CH2:8][CH2:9][CH:10]([NH:13][C:20]3[N:19]=[N:18][C:17]([Cl:16])=[CH:22][CH:21]=3)[CH2:11][CH2:12]2)=[CH:14][CH:15]=1A solution of 1-(4-chlorobenzyl)-piperidin-4-yl amine (1 g, 4.45 mmol) (prepared by a procedure similar to that described in WO2001098273), 3,6-dichloropyridazine (670 mg, 4.45 mmol) and sodium carbonate (940 mg, 8.90 mmol) in dimethylacetamide (5 ml) was heated at 120° C. in a microwave reactor (Emrys Optimizer; 0-9 Barr) for 40 minutes. After this period, the reaction mixture was diluted with water and extracted with dichloromethane. The organic layer was dried (MgSO4), filtered and the solvents evaporated in vacuo. Purification by reverse phase HPLC (conditions as previously described) gave E16 (228 mg, 15%). C16H18Cl2N4 requires 336; Found 337 (MH+). 1H NMR (360 MHz, CDCl3) δ1.52 (qd, J=11.5, 3.5 Hz, 2H), 2.08 (d, J=12.5 Hz, 2H), 2.16 (t, J=11.3 Hz, 2H), 2.82 (d, J=11.5 Hz, 2H), 3.48 (s, 2H), 3.77-3.87 (m, 1H), 4.55 (d, J=7.8 Hz, 1H), 6.59 (d, J=9.3 Hz, 1H), 7.14 (d, J=9.3 Hz, 1H), 7.25 (d, J=7.7 Hz, 2H), 7.29 (d, J=7.7 Hz, 2H)
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