Potassium Carbonate → HCID 22477296, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of benzyl 1-[3,6-dihydro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl](2H)pyridinecarboxylate (2 g, prepared according to the procedure described by P. Eastwood, Tetrahedron Letters, 2000, 41, pages 3705–3708), dichloro[1,1′-bis(diphenylphosphino)-ferrocene]palladium[II] (0.25 g,) and potassium carbonate (2.42 g), under nitrogen, was treated with a solution of trifluoro-methanesulfonic acid 1-methyl-3-[1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-2-yl]-1H-indol-5-yl ester [1.6 g, Reference Example 18(a)] in dimethylformamide (76 mL). The mixture was heated at 80° C. for 4 hours (tlc indicated that starting material was still present), then treated with a further quantity of trifluoro-methanesulfonic acid 1-methyl-3-[1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-2-yl]-1H-indol-5-yl ester (0.15 g), then heated at reflux temperature for 4 hours and then left at room temperature overnight. A further quantity of trifluoro-methanesulfonic acid 1-methyl-3-[1-(toluene-4-sulfonyl)-1H-pyrrolo[2,3-b]pyridin-2-yl]-1H-indol-5-yl ester [0.15 g, Reference Example 18(a)] was added and the mixture was heated at reflux temperature for a further 4 hours then evaporated. The residue was partitioned between ethyl acetate and water, and the aqueous layer was extracted three times with ethyl acetate (50 mL). The combined organic phases were washed with brine, then dried over magnesium sulfate and then evaporated. The residue was subjected to flash chromatography on silica eluting with a mixture of ethyl acetate and pentane (1:1, v/v) to give the title compound as a light brown viscous liquid which was used without further purification.

Provenance & Evidence