Sodium Carbonate → tert-butyl N-[4-[3-(2-amino-4-methoxy-6-methylphenyl)phenyl]sulfonyl-5-methylsulfanylthiophene-2-carboximidoyl]carbamate

Participants

Reaction Conditions

Reaction Steps

A solution of {[4-(3-bromo-benzenesulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester ((Example 27: step c) 1.50 g, 3.05 mmol) in toluene:EtOH (2:1, 45 mL) was treated with 5-methoxy-3-methyl-2-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenylamine (((Example 198: step d) 1.61 g, 6.11 mmol), aqueous Na2CO3 (2 M, 12.2 mL, 24.4 mmol) and Pd (PPh3)4 (0.706 g, 0.611 mmol). The mixture was heated to 80° C. 4 h. The reaction was cooled to room temperature, diluted with EtOAc, washed with brine (1×75 mL) and water (2×75 mL), dried over MgSO4 and concentrated in vacuo. Silica gel chromatography (25% then 35% then 50% EtOAc in hexanes) afforded the product {[4-(2′-amino-4′-methoxy-6′-methyl-biphenyl-3-sulfonyl)-5-methylsulfanyl-thiophen-2-yl]-imino-methyl}-carbamic acid tert-butyl ester (0.680 g, 40%) as a yellow-brown solid. 1H NMR (MeOD): δ 8.223 (s, 1H), 8.001 (d, 1H, J=7.2 Hz), 7.879 (t, 1H, J=1.6 Hz), 7.698 (t, 1H, J=8.0 Hz), 7.549 (d, 1H, J=8.0 Hz), 6.287 (dd, 2H, J=7.2 Hz, J=2.4 Hz), 3.770 (s, 3H), 2.669 (s, 3H), 1.900 (s, 3H), 1.510 (s, 9H). C25H29N3O5S3: 548.13 (M+1) found 547.70.

Provenance & Evidence