Two new compounds, isoquinoline-1, 3-dicarboxyaldehyde and (IDA) were synthesizedvia 6 or 7 steps starting from benzaldehyde, or prepared via 4 steps starting from allylbenzene. Two new compounds, isoquinoline-1, 3-dicarboxyaldehyde and (IDA) were synthesizedvia 6 or 7 steps starting from benzaldehyde, or prepared via 4 steps starting from allylbenzene.