N,N'-Bis(dimethylaminomethylene)hydrazine

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

Procedure: 17.3 g (50.0 mmols) of 3-(4-aminophenyl)-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin, 10.5 g (75.0 mmols) of 1,2-bis-(dimethylaminomethylene)-hydrazine and 200 mg of 4-methylbenzenesulphonic acid are refluxed in 40 ml of anhydrous dimethylformamide for 10 hours under an N2 atmosphere. A further 3.50 g (25.0 mmols) of 1,2-bis-(dimethylaminomethylene)-hydrazine are then added, and the mixture is refluxed for a further 10 hours. 16.1 g (81%) of pale yellow crystals are precipitated on cooling the mixture. Recrystallisation from dimethylformamide yields 14.3 g (72%) of 3-(4-(1,2,4-triazol-4-yl)-phenyl)-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin in the form of small pale yellow crystals of melting point 321°-323° C. the mixture is refluxed for a further 10 hours 16.1 g (81%) of pale yellow crystals are precipitated on cooling the mixture Recrystallisation from dimethylformamide

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

Procedure: 17.3 g (50.0 mmols) of 3-(4-aminophenyl)-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin, 10.5 g (75.0 mmols) of 1,2-bis-(dimethylaminomethylene)-hydrazine and 200 mg of 4-methylbenzenesulphonic acid are refluxed in 40 ml of anhydrous dimethylformamide for 10 hours under an N2 atmosphere. A further 3.50 g (25.0 mmols) of 1,2-bis-(dimethylaminomethylene)-hydrazine are then added, and the mixture is refluxed for a further 10 hours. 16.1 g (81%) of pale yellow crystals are precipitated on cooling the mixture. Recrystallisation from dimethylformamide yields 14.3 g (72%) of 3-(4-(1,2,4-triazol-4-yl)-phenyl)-7-(4-ethyl-5-methyl-2H-1,2,3-triazol-2-yl)-coumarin in the form of small pale yellow crystals of melting point 321°-323° C. the mixture is refluxed for a further 10 hours 16.1 g (81%) of pale yellow crystals are precipitated on cooling the mixture Recrystallisation from dimethylformamide

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

Procedure: To a solution of 1,2-bis[(dimethylamino)methylene]hydrazine (660 mg) in toluene (10 ml) was added 1-benzylpiperidin-4-amine (0.8 ml) and p-toluenesulfonic acid (75 mg) and the resulting mixture was stirred at room temperature for 18 hours. The reaction mixture was refluxed for 8 hours and then evaporated to dryness. The residue was purified by chromatography on silica eluting with a gradient of methanol/ethyl acetate to give 1-benzyl-4-(4H-1,2,4-triazol-4-yl)piperidine. Yield 220 mgs. NMR (d6 DMSO): 2.0 (m, 4H), 2.1 (m, 2H), 2.9 (m, 2H), 3.5 (s, 2H), 4.2 9m, 1H), 7.35 (m, 5H), 8.65 (s, 2H). The reaction mixture was refluxed for 8 hours evaporated to dryness The residue was purified by chromatography on silica eluting with a gradient of methanol/ethyl acetate