2-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline → 5-methoxy-N-(2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1-methyl-1H-pyrrolo[2,3-c]pyridine-2-carboxamide

Participants

Reaction Steps

To 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (2.09 g, 8.37 mmol) in tetrahydrofuran (20 ml) under a nitrogen atmosphere was added ethylmagnesium chloride, 2.0 M in tetrahydrofuran (4.19 ml, 8.37 mmol) and the mixture was heated at reflux for one hour. To the warm reaction was added methyl 5-methoxy-1-methyl-1H-pyrrolo[2,3-c]pyridine-2-carboxylate (878 mg, 3.99 mmol) in tetrahydrofuran (10 ml) and the resulting mixture was heated overnight. Then the reaction mixture was cooled to room temperature and concentrated. The residue was taken up in ethyl acetate and washed with water. The aqueous layer was extracted with ethyl acetate twice. The combined organic layers were washed with brine, dried (Na2SO4) and concentrated in vacuo. The residue was coated on hydromatrix and purified by flash chromatography (gradient of heptane to heptane/ethyl acetate 1/1) to give 5-methoxy-N-(2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1-methyl-1H-pyrrolo[2,3-c]pyridine-2-carboxamide (1.05 g).

Provenance & Evidence