2-Amino-3-(benzimidazol-2-yl)benzo[b]furans

1H‐Benzimidazole‐2‐acetonitriles as synthon in fused benzimidazole synthesis

“…Treatment of 2,3,5‐trimethyl‐1,4‐benzoquinone with 3 (R = H, Me) gave 2‐amino‐3‐(benzimidazol‐2‐yl)benzo[ b ]furans 203 in high yield, respectively. Compound 203 were converted to 87–98% 204 (R 1 = R 2 = H; R 1 = Me, R 2 = Ac; R 1 = Et, R 2 = COEt; R 1 = Pr, R 2 = COPr; R 1 = Ph, R 2 = Bz) by treatment with anhydrides trialkylorthoformate or acid chlorides (Scheme ) [112].…”