Methyl 3-bromothiophene-2-carboxylate → 3-(6-Phenylpyridazin-4-yl)thiophene-2-carboxylic Acid Methyl Ester

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3-Phenyl-5-(tri-n-butylstannyl)pyridazine (50 mg, 0.11 mmol), methyl 3-bromothiophene-2-carboxylate (30 mg) and Pd(PPh3)4 (5 mg) in THF (2 ml) were combined and heated to 150° C. for 600 seconds in a Smith Synthesizer microwave reactor. The reaction was diluted with CH2Cl2 (6 ml) and H2O (2 ml) then poured into PTFE (5 μM) fritted syringe barrels. The organic phase was collected and concentrated to leave 85 mg of crude product. Part of the sample was purified by HPLC with mass triggered collection of fractions to give the title compound (3.9 mg). δH (400 MHz, d6 DMSO) 3.73 (3H, s), 7.52-7.62 (4H, m), 8.10 (1H, d, J 8.0), 8.22 (2H, dd, J 1.6 and 8.0), 8.35 (1H, d, J 4.0), 9.33 (1H, d, J 4.0); m/z (ES+) (MH+) 297.

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