Pyridine → HCID 20144171, compound

Participants

Reaction Steps

A solution of 5.03 g of 3-benzofuranethanol and 8 g of p-toluenesulfonyl chloride in 20 ml of pyridine was kept in a refrigerator for one week. Most of the pyridine was removed under vacuum, and the residue dissolved in ether and washed successively with 5% hydrochloric acid, water, and 5% sodium bicarbonate solution and dried. Removal of the solvent left 5.93 g of crude 3-benzofuranethanol, p-toluenesulfonate which was heated with 8 g of methylamine in 25 ml of tetrahydrofuran to 100° for 4 hours. The mixture was concentrated, made basic with aqueous sodium hydroxide, and extracted with methylene chloride. The crude amine so obtained was short-path distilled (bath 120°, 0.5 micron) to give 3.17 g (59% yield) of N-methyl 3-benzofuranethylamine. NMR spectrum (in CDCl3): τ2.4-3.0 (m, 5); 7.2 (s, 4); 7.6 (s, 3) and 9.0 (s, 1).

Provenance & Evidence