Synthesis of 5H‐indeno[1,2‐b]pyridine derivatives: Antiproliferative and antimetastatic activities against two human prostate cancer cell lines

This study describes the direct synthesis of 2‐amino‐4‐(phenylsubstituted)‐5H‐indeno[1,2‐b]pyridine‐3‐carbonitrile derivatives 5–21, through sequential multicomponent reaction of aromatic aldehydes, malononitrile, and 1‐indanone in the presence of ammonium acetate and acetic acid (catalytic). The biological study showed that compound 10 significantly impeded proliferation of the cell lines PC‐3, LNCaP, and MatLyLu. The antimetastatic effects of compound 10 could be related with inhibition of MMP9 in the PC‐3 and LNCaP human cell lines. On the basis of a study of the structure–activity relationship of these compounds, we propose that the presence of two methoxy groups at positions 6 and 7 of the indeno nucleus and a 4‐hydroxy‐3‐methoxy phenyl substitution pattern at position 4 of the pyridine ring is decisive for these types of molecules to exert very good antiproliferative and antimetastatic activities. 2‐Amino‐4‐(phenylsubstituted)‐5H‐indeno[1,2‐b]pyridine‐3‐carbonitrile derivatives 5–21 were synthesized through sequential multicomponent reaction of aromatic aldehydes, malononitrile, and 1‐indanone. Compound 10 significantly inhibited the proliferation of PC‐3, LNCaP, and MatLyLu cells. The antimetastatic effects of compound 10 can be correlated with the inhibition of MMP9 in the PC‐3 and LNCaP cells.