Bromine → 3-Bromothieno[2,3-d]pyridazine

Participants

Reaction Conditions

Reaction Steps

A solution of thieno[2,3-d]pyridazine (468.0 mg, 3.437 mmol) and sodium acetate (879.2 mg, 10.50 mmol) in acetic acid (14 mL) was charged with bromine (0.55 mL, 11 mmol) and then irradiated under microwave heating at 90° C. for 3 h. The reaction mixture was concentrated in vacuo. Purification by ISCO chromatography (1 to 15% methanol:dichloromethane) afforded 210.6 mg (27%) of the title compound as a pink solid. 1H NMR (400 MHz, DMSO-d6): δ 9.96 (d, J=1.52 Hz, 1H), 9.53 (d, J=1.52 Hz, 1H), 8.51 (s, 1H); MS (ESI): 214.97, 216.92 [M+H]+; HPLC tR=2.68 min.

Provenance & Evidence