Iron-catalyzed AAPE reaction using 10-methylacridin-9(10H)-one O-methyl oxime (1) and diphenyl acetylene by using a benzofuryl trisphosphine (TP1) 21 as ligand and Al(i-Bu)3/catechol provided 20 aza-annulation product (3) quantitively. The combination of catechol with Al(i-Bu)3 generating a formular of i-BuAl•catecholate mitigates the nucleophilicity of organoaluminium base, and suppressed undesired side reactions such as C-H alkylation. The β-H-elimination , which was known to poison the catalytic cycle of C-H activation, was also suppressed. The detailed condition for iron-catalyzed AAPE reaction using 10-methylacridin-9(10H)-one Omethyl oxime (1) with diphenyl acetylene is shown in Figure (top equation). The O-methyl oxime was easily synthesized from the corresponding ketone in high yield (95% for 1). To a Schlenk tube charged with oxime ether (1), tolane (1.5 equiv), Fe(acac)3 (10 mol %), TP1, and catechol (200 mol%) was added xylene followed by slow addition of a solution of Al(i-Bu)3 in toluene at room temperature. The reaction 5 mixture was stirred at r.t. for 5 mins to allow generation of i-BuAl•catecholate in-situ. Up heating at 140 °C for 24h, the reaction yielded the cyclization product quantitatively as indicated by H-NMR analysis.