2-Bromopyridine → HCID 11651703, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 2-(but-3-ynyl)-2H-indazole and 1-(but-3-ynyl)-1H-indazole (160 mg, 0.94 mmol) in DMF (0.5 mL) was added to a suspension of CuI (8.9 mg, 47 μmol), Et3N (2.5 mL), Pd(PPh3)2Cl2 (33 mg, 47 μmol), PPh3 (6.2 mg, 23 μmol) and 2-bromopyridine (149 mg, 0.94 mmol). The reaction mixture was heated at 120° C. for 900 s in a microwave. The reaction mixture was quenched with water, Et3N was evaporated and the aqueous phase was extracted with DCM. The organic phase was washed with a saturated solution of NH4OH, brine, dried over MgSO4, filtered and evaporated. The crude residue was purified by flash chromatography (DCM/MeOH 99:1) and SCX column (DCM, DCM/MeOH 98:2, DCM/MeOH/NH4OH 95:4:1 to 94:4:2) to yield 6.8 mg (27 μmol, 3%) of 2-(4-(pyridin-2-yl)but-3-ynyl)-2H-indazole as a yellow solid and 4.6 mg (19 μmol, 2%) of 1-(4-(pyridin-2-yl)but-3-ynyl)-1H-indazole as an orange oil.

Provenance & Evidence