4-BROMO-N-ETHYLBENZENESULPHONAMIDE

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 0.348 g of N-ethyl4-bromobenzenesulfonamide, 0.42 g of bis-pinacolato)diboron, 0.025 g of 1,1′-bis-(diphenylphosphino)-ferrocene, 0.033 g of [1,1′-bis(diphenylphosphino)-ferrocene]palladium-dichloride (complex with CH2Cl2), 0.442 g of potassium acetate in 6 ml of degassed dioxane are heated to 90° C. in a sealed-tube under N2 for 17 hours. To the resulting mixture 5 ml of degassed dioxane, 0.371 g of 2-[2-(4-methoxypyridin-2-yl)ethyl]-6-iodo-3H-imidazo[4,5-b]pyridine (starting material A1), 0.113 g of tetrakis(triphenylphos-phine)-palladium(0) and a solution of 0.27 g of potassium carbonate and 0.083 g of lithium chloride in 5 ml of degassed water are added under N2. The tube is sealed again, the mixture is heated to 115° under N2 for 7 hours and, after cooling, addition of water and adjusting the pH to 7, it is extracted three times with dichloromethane. The combined organic phases are dried over sodium sulfate, concentrated and the residue is chromatographed on a silica gel column (dichloromethane/methanol 25-15:1). Concentration of the chromatographically pure fractions and crystallisation from ethylacetate gives 0.248 g of the title compound as a solid of m.p. 214-216° C. The mass spectrum shows the molecular peak MH+ at 438.4 Da. The tube is sealed again the mixture is heated to 115° under N2 for 7 hours after cooling is extracted three times with dichloromethane The combined organic phases are dried over sodium sulfate concentrated the residue is chromatographed on a silica gel column (dichloromethane/methanol 25-15:1) Concentration of the chromatographically pure fractions and crystallisation from ethylacetate

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

Procedure: In an analogous manner to general procedure B, 4-bromo-N-ethylbenzenesulfonamide (105 mg, 0.40 mmol), 5-cyano-1-methyl-1H-pyrrol-2-ylboronic acid (72 mg, 0.48 mmol), potassium fluoride (76 mg, 1.3 mmol), and tris(dibenzylideneacetone)dipalladium(0) (10 mg, 0.01 mmol) were placed in an oven dried flask under nitrogen and dry THF (1.0 mL) was added. Tri-t-butylphosphine (60 μL, 0.02 mmol, 10 wt % in hexane) was added and the reaction was stirred for 16 hours. 4-(5-cyano-1-methyl-1H-pyrrol-2-yl)-N-ethylbenzenesulfonamide (15 mg, 13%) was provided after purification. MS (ESI) m/z 289. HPLC purity 100.0% at 210-370 nm, 9.6 min.; the Xterra® RP18 column, 3.5μ, 150×4.6 mm column, 1.2 mL/min., 85/15-5/95 (ammonium formate buffer pH=3.5/ACN+MeOH) for 10 min., hold 4 min. dried flask under nitrogen dry THF (1.0 mL) was added

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

Procedure: Following general procedure A, 4-Bromobenzene sulfonyl chloride (0.40 g, 1.56 mmol) and ethylamine (5 mL, [2.0M], 10 mmol) were stirred together for 16 hours. 4-bromo-N-ethylbenzenesulfonamide (0.11 g) was provided after purification. MS (ESI) m/z 264. HPLC purity 100.0% at 210-370 nm, 8.1 min.; the Xterra® RP18 column, 3.5μ, 150×4.6 mm column, 1.2 mL/min., 85/15-5/95 (ammonium formate buffer pH=3.5/ACN+MeOH) for 10 min., hold 4 min.

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

Procedure: Following general procedure A, 4-Bromobenzene sulfonyl chloride (0.40 g, 1.56 mmol) and ethylamine (5 mL, [2.0M], 10 mmol) were stirred together for 16 hours. 4-bromo-N-ethylbenzenesulfonamide (0.11 g) was provided after purification. MS (ESI) m/z 264. HPLC purity 100.0% at 210-370 nm, 8.1 min.; the Xterra® RP18 column, 3.5μ, 150×4.6 mm column, 1.2 mL/min., 85/15-5/95 (ammonium formate buffer pH=3.5/ACN+MeOH) for 10 min., hold 4 min.