Cesium carbonate → Methyl 3-((3-Bromo-2-methylphenylamino)methyl)-5-tert-butylthiophene-2-carboxylate

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Reaction Steps

A 250-mL single-necked round-bottomed flask equipped with a magnetic stirrer was purged with nitrogen and charged with 102c (1.09 g, 4.68 mmol), 3-bromo-2-methylaniline (2.61 g, 14.0 mmol) and acetonitrile (25 mL). Cesium carbonate (1.67 g, 5.15 mmol) was added and the mixture was stirred at room temperature for 16 h. The reaction mixture was then concentrated under reduced pressure. Purification of the resulting residue by column chromatography afforded a 70% yield (1.30 g) of 102d as a yellow oil: 1H NMR (300 MHz, CDCl3) δ 6.92 (m, 2H), 6.85 (s, 1H), 6.57 (dd, 1H, J=4.8, 2.1 Hz), 4.60 (s, 2H), 3.86 (s, 3H), 2.29 (s, 3H), 1.37 (s, 9H); MS (ESI+) m/z 396.2 (M+H).

Provenance & Evidence