Sodium Carbonate → HCID 66958157, compound

Participants

Reaction Conditions

Reaction Steps

The mixture of 3-bromo-5-nitro-1H-indazole (484.1 mg, 2.0 mmol, 1.0 eq), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (927.7 mg, 1.0 eq), (PPh3)4Pd (0) (462 mg, 0.2 eq), Na2CO3 (2M, 3.0 mL, 3.0 eq) in dioxane (12 mL) was degassed and heated at 120° C. in a microwave-oven synthesizer for 2 h. The mixture was cooled to room temperature and filtered through a celite pad to remove Na2CO3 and catalyst. The celite pad was washed with EtOAc. The solvent was removed and the crude was purified by silica gel chromatography (0%˜20% MeOH/DCM) to obtain the desired product tert-butyl 4-(5-nitro-1H-indazol-3-yl)-5,6-dihydropyridine-1(2H)-carboxylate (618 mg, isolated yield 90%).

Provenance & Evidence