Methyl 4-Formylbenzoate → 4-(1-Ethyl-5-trifluoromethanesulfonyl-1H-benzoimidazol-2-yl)-benzoic acid methyl ester

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Reaktionsschritte

N1-Ethyl-4-trifluoromethanesulfonyl-benzene-1,2-diamine (134 mg, 0.50 mmol) and methyl 4-formylbenzoate (82 mg, 1.1 equiv) were dissolved in 0.8 mL dry pentanol and heated to reflux for 18 h. The reaction mixture was then evaporated to one-third volume by blowing with a stream of nitrogen while heating. Upon cooling, the solids were collected and washed with ether to yield 155 mg upon drying. The solids may be recrystallized from EtOAc/ether to yield pure ester 35: 1HNMR (400 MHz, d6-DMSO) δ 8.48 (d, J=1.65 Hz, 1H), 8.19 (m, 3H), 8.01 (m, 3H), 4.45 (q, J=7.24 Hz, 2H), 3.92 (s, 3H), 1.36 (t, J=7.22 Hz, 3H); LCMS-APCI in/z 413 [M+1]+.

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