Formaldehyde → 7-Iodo-1,2,3,4-tetrahydro[1]benzofuro[2,3-c]pyridine

Participants

Reaction Conditions

Reaction Steps

Paraformaldehyde (8.9 g, 0.297 mol) was added to a solution of 2-(6-iodo-1-benzofuran-3-yl)ethanamine hydrochloride (80 g; 0.247 mol) in 1N HCl (500 mL) under N2. After 2 h stirring at 70° C., another portion of paraformaldehyde (740 mg) was added. The reaction mixture was cooled down to r.t., filtered, the resulting solid was washed with 1N HCl (100 mL), dried overnight under house vacuum to afford 76.7 g of the title product as a hydrochloric acid salt. 1H-NMR (400 MHz, CDCl3): δ 2.06 (bt, 2H), 2.92 (bt, 2H), 4.37 (s, 2H), 7.45 (d, 1H) 7.62 (dd, 1H), 8.05 (d, 1H), 10.04 (bs, 2H).

Provenance & Evidence