Triethylamine → N-(4-Aminothiophen-3-yl)-4-[(3,4-dimethoxyphenylamino)-methyl]-benzamide

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Acid 424a (1040 mg; 3.62 mmol); 3,4-diaminothiophene dihydrochloride (1017 mg; 5.44 mmol; 1.50 eq.) and BOP (1770 mg; 4.0 mmol; 1.1 eq.) were suspended in MeCN, treated with triethylamine (4 mL; 29 mmol) and stirred for 18 h at room temperature; concentrated and purified by chromatographic column on silica gel (elution 50% EtOAc in DCM) to render 527 mg (1.37 mmol; 38% yield) of compound 424c which was 90% pure. 1H-NMR (300.07 MHz; DMSO-d6) δ (ppm): 8.56 (s, 1H), 7.78 (d, J=7.9 Hz, 2H), 7.43 (d, J=3.5 Hz, 1H), 7.38 (d, J=7.9 Hz, 2H), 6.73 (d, J=8.8 Hz, 1H), 6.33 (d, J=3.5 Hz, 1H), 6.58 (d, J=2.6 Hz, 1H), 6.13 (dd, J=2.6, 8.3 Hz, 1H), 4.33 (s, 2H), 3.80 (s, 3H), 3.78 (s, 3H). LRMS: calc: 383.4642; found: 384.2 (M+H); 406.2 (M+Na) and 192.6 (M+2H)/2.

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