Toluene → 4-(5-Tert-butoxy-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophene-2-carboxylic acid ethyl ester

Participants

Reaction Steps

The procedure used in Example 1: step d was followed using benzeneboronic acid (42 mg, 0.35 mmol), 4-(3-bromo-5-tert-butoxy-benzenesulfonyl)-5-methylsulfanyl-thiophene-2-carboxylic acid methyl ester ((Example 12: step c) (83 mg, 0.17 mmol)), Na2CO3 (2M, 1.4 mL, 2.8 mmol), Pd(PPh3)4 (48 mg, 0.04 mmol), toluene (5.6 mL), and ethanol (2.8 mL). Analogous aqueous workup and SiO2 flash chromatography (20% EtOAc in hexanes) yielded the title compound (55 mg, 65%). 1H-NMR (CDCl3): δ 8.03 (s, 1H), 7.91 (t, 1H, J=1.6 Hz), 7.63 (t, 1H, J=2.0 Hz), 7.57 (m, 2H), 7.47 (m, 2H), 7.41 (m, 2H), 4.33 (q, 2H, J=7.2 Hz), 2.60 (s, 3H), 1.42 (s, 9H), 1.36 (t, 3H, J=7.2 Hz).

Provenance & Evidence