Dichloromethane → 5-[7-(1-methyl-cyclohexanecarbonyl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl]-thiophene-2-carboxylic acid

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Reaction Steps

A mixture of 5-(dihydroxyboryl)-2-thiophene-carboxylic acid (1.0 g, 5.4 mmol), [2-bromo-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazin-7-yl]-(1-methyl-cyclohexyl)-methanone (2.2 g, 4.9 mmol), potassium carbonate (2.0 g, 15 mmol), and Pd(dppf)Cl2.CH2Cl2 (0.400 g, 0.489 mmol) in 12 mL of 1,4-dioxane and 3 mL of water was stirred at 120° C. in a microwave for 40 min. The resulting red suspension was partitioned between 60 mL of ethyl acetate and 100 mL of water, and the aqueous layer was extracted with three 60 mL portions of ethyl acetate. The combined organic layers were dried over MgSO4, filtered and concentrated to a residue. Column chromatography (0->50% EtOAc/hexanes) afforded 1.24 g (46%) of 5-[7-(1-methyl-cyclohexanecarbonyl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl]-thiophene-2-carboxylic acid as a brown solid.

Provenance & Evidence