Nitrogen → 6-chloro-3-cyclopropyl-1-trityl-1H-pyrazolo[4,3-c]pyridine

Participants

Reaction Conditions

Reaction Steps

To a flask were added 6-chloro-3-iodo-1-trityl-1H-pyrazolo[4,3-c]pyridine (3a, 2 g, 3.83 mmol), cyclopropylboronic acid (0.560 g, 6.52 mmol)), potassium carbonate (1.3 g, 9.6 mmol), 1,1′-bis(diphenylphosphino)ferrocene-palladium(ii) dichloride dichloromethane complex (0.157 g, 0.192 mmol), dioxane (10 ml), and water (5 ml). The mixture was Vac/N2 purged 6 times and heated at 60° C. After 5 h, the reaction was treated further with cyclopropylboronic acid (0.560 g, 6.52 mmol)), potassium carbonate (1.3 g, 9.6 mmol), 1,1′-bis(diphenylphosphino)ferrocene-palladium(ii)dichloride dichloromethane complex (0.157 g, 0.192 mmol), then degassed, and then heated at 80° C. overnight. The mixture was diluted with DCM and water and then filtered through celite. The organic phase was separated and concentrated to afford a dark residue, which was purified on silica gel (40 g, 0-20% ethyl acetate/hexanes) to afford 6-chloro-3-cyclopropyl-1-trityl-1H-pyrazolo[4,3-c]pyridine (1.4 g, 84% yield) as a white foam. MS ESI calc'd. for C28H22Cl1N3[M+1]+ 436, found 436.

Provenance & Evidence