“…[41] With the aim to reduce the amount of nucleophile required, different amines [31c] were tested to generate the catalytically active species "amine-[Fe(CO) 4 ]". [33][34][35]42] By using 1,8-diazabicycloundec-7-ene (DBU) or N,N-diisopropylethylamine (DIPEA) and 2 (1.2 equiv), almost the same yield of 3 was observed (entries 4 and 5, Table 1). The addition of DMF or NH 3 produced a dramatic reduction in reaction yields (entries 7 and 8, Table 1), whereas triethylamine (TEA, 4 equiv) gave 3 in 70 % isolated yield after microwave irradiation for 15 min at 90 8C, in the presence of CO (1.3 bar) and nPrNH 2 (1.2 equiv; entry 6 , Table 1).…”