Methylamine → HCID 18322369, compound

Participants

Reaction Steps

Under argon, 3-amino-5-tert-butyl-thiophene-2-carboxylate (2.13 g, 10 mmol) was added to a premixed (15 minutes) methylene chloride (50 mL) solution of trimethylaluminum (5.0 mL, 2.0 M in hexanes) and methylamine (5.0 mL, 2.0 M in THF). The mixture solution was stirred at room temperature for 10 minutes and heated at 41° C. for 3 days. The mixture was cooled and carefully quenched with dilute HCl followed by extraction with methylene chloride. The organic phase was dried over sodium sulfate and concentrated. Column chromatography (hexanes/ethyl acetate) gave 0.3 g of 3-amino-5-tert-butyl-thiophene-2-carboxylic acid methylamide in 14% yield: 1H NMR (300 MHz, CDCl3) δ 6.44 (s, 1H), 5.6 (br, 2H), 5.4 (br, 1H), 3.02 (d, 3H), 1.44 (s, 9H); MS (m/e): 212.9 (M+1).

Provenance & Evidence