3-(Tributylstannyl)pyridine → 2-(4-Fluorophenyl)-1-(2-cyclopentylamino-4-pyrimidinyl)-5-(3-pyridyl)imidazo-[4,5-b]pyridine

Beteiligte Stoffe

Reaktionsschritte

5-Chloro-2-(4-fluorophenyl)-1-(2-cyclopentylamino-4-pyrimidinyl)imidazo[4,5-b]pyridine (2 g 4.9 mmol), 3-tributylstannylpyridine (3.6 g 9.8 mmol) and PdCl2(PPh3)2 (340 mg 0.48 mmol) are heated in xylene (50 ml) for 3 h at 150° C. under argon. The reaction mixture is filtered at 60° C. and chromatographed over SiO2 (acetone/hexanes 3/7 to 6/4) to yield pale yellow crystals (1.3 g). Recrystallisation from THF/hexanes renders the title compound as colorless crystals (985 mg 45%).

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