1-ethylsulfonylpiperidin-4-amine

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

Procedure: Triethylamine (10 mL) was added to a dichloromethane (90 mL) solution of Benzyl piperidin-4-ylcarbamate (5.09 g) at 0° C. followed by the dropwise addition of ethane sulfonylchloride (which may be referred to as sso10; 3.2 mL; TCI) and the resulting mixture was stirred overnight slowly raising to room temperature. 1 N Hydrochloric acid (90 mL; WAKO) was added to the reaction mixture solution, the resulting mixture was stirred for approx. 10 minutes, then the reaction mixture was extracted with chloroform, the organic layer was dried, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (Yamazen; chloroform/methanol). Palladium hydroxide (20% by weight, Wet-type, 5 g; NECHEM) was added to a methanol (90 mL) solution of this product under a nitrogen atmosphere. The atmosphere in a reaction vessel was replaced with hydrogen at room temperature, the resulting mixture was stirred overnight, the atmosphere in the reaction vessel was returned to a nitrogen atmosphere, the residue was removed by filtration, the solvent was evaporated under reduced pressure, and the residue was dried to give the title compound (3.32 g). the resulting mixture was stirred for approx. 10 minutes the reaction mixture was extracted with chloroform the organic layer was dried the solvent was evaporated under reduced pressure the residue was purified by silica gel column chromatography (Yamazen; chloroform/methanol) Palladium hydroxide (20% by weight, Wet-type, 5 g; NECHEM) was added to a methanol (90 mL) solution of this product under a nitrogen atmosphere The atmosphere in a reaction vessel was replaced with hydrogen at room temperature the resulting mixture was stirred overnight the residue was removed by filtration the solvent was evaporated under reduced pressure the residue was dried

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Into a 8-mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed 6-[bis(4-chlorophenyl)methyl]-4-bromoquinolin-2-ol (150 mg, 0.33 mmol, 1.00 equip), 1-(ethanesulfonyl)piperidin-4-amine (94.12 mg, 0.49 mmol, 1.50 equip), Pd2(dba)3 (30 mg, 0.03 mmol, 0.10 equip), dppf (63.4 mg, 0.11 mmol, 0.35 equip), Cs2CO3 (266 mg, 0.82 mmol, 2.50 equip), and 1,4-dioxane (3 mL). The resulting solution was stirred overnight at 100° C. The reaction was then quenched by the addition of water (100 mL). The resulting solution was extracted with ethyl acetate (3×50 mL) and the organic layers combined and dried over anhydrous sodium sulfate. The solids were filtered out. The filtrate was concentrated under vacuum. The residue was applied onto a silica gel column with dichloromethane/methanol (20:1). The resulting residue was recrystallized from ethyl acetate:petroleum ether in the ratio of 1:10 to yield 6-[bis(4-chlorophenyl)methyl]-4-[[1-(ethanesulfonyl)piperidin-4-yl]amino]quinolin-2-ol as an off-white solid. Into a 8-mL round-bottom flask purged maintained with an inert atmosphere of nitrogen The reaction was then quenched by the addition of water (100 mL) The resulting solution was extracted with ethyl acetate (3×50 mL) dried over anhydrous sodium sulfate The solids were filtered out The filtrate was concentrated under vacuum The resulting residue was recrystallized from ethyl acetate

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

Procedure: A 50 ml three-necked flask equipped with a magnetic stirrer and with an argon intake is charged with 350 mg of 3-bromo-5-(2,6-difluorophenyl)-2-(2-trimethylsilanylethoxymethyl)-2H-pyrazolo[4,3-c]isoquinoline-7-carbaldehyde, prepared in step 5 of example 2, in 7.8 ml of 1,4-dioxane. 195 mg of 1-ethylsulphonylpiperidin-4-ylamine, 880 mg of caesium carbonate, 59 mg of 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene and 15 mg of palladium(II) acetate are added. The mixture is heated at reflux for 2 h. After cooling, the mixture is poured into water and extracted with AcOEt. The organic phase is washed with saturated NaCl solution, dried over MgSO4, filtered and concentrated under RP. It is purified by flash chromatography on silica gel (15-40 μm), eluting with a mixture of cyclohexane and AcOEt (75/25 by vol.), to give 195 mg of 5-(2,6-difluorophenyl)-3-{[1-(ethylsulphonyl)piperidin-4-yl]amino}-1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-pyrazolo[4,3-c]isoquinoline-7-carbaldehyde (yellow foam). LC-MS-DAD-ELSD 628=(M−H)(+). A 50 ml three-necked flask equipped with a magnetic stirrer and with an argon intake The mixture is heated at reflux for 2 h After cooling extracted with AcOEt The organic phase is washed with saturated NaCl solution dried over MgSO4 filtered concentrated under RP It is purified by flash chromatography on silica gel (15-40 μm) eluting with a mixture of cyclohexane and AcOEt (75/25 by vol.)