Synthesis of Methyl Derivatives of 4H‐Furo[2,3‐h]quinolin‐4‐one and 5H‐Furo[3,2‐g]quinolin‐5‐one

Synthesis of the linear and angular furoquinolin-4-one derivatives 6 and 12 was performed, using nitrobenzofurans 3 and 9 as key intermediates. These compounds were reduced to the corresponding aminobenzofurans 4 and 10, which were condensed in two steps to yield, the linear furoquinolin-4-ones 6a,b and the angular ones 12a,b.