Dunfermline then forced Harry Sharp into a good save which he turned the shot away for a pars corner, Dundee first chance fell to McMullen but he fired high over the bar.
But soon after it was 1-0 for Dundee a quick break away and Thomas found Paul McMullan who this time fired the ball home for a good goal.
Ten minutes later and it was 1-1 a good cross was headed home by McCann, so 1-1 at half time.
Still the game went from end to end, but Dundee took the lead on the hour a quick corner McMullan found Mulligan and he squared the ball to Fin Robertson who scored with a solid shot.
Dundee all but sealed the tie with seven minutes remaining when substitutes Cillian Sheridan and Luke McCowan combined. The former flicking on a ball forward and Luke McCowan scored with a shot from the edge of the box for a fine goal.
Into stoppage time and Dundee added a forth, Max Anderson this time, again from just outside the box finding the bottom corner.
A couole of minutes later and ExDee Craig Wighton scored a great goal with a stunning finish.
A hard game and all credit to Dunfermline for having a go in this match.
Dundee: Sharp, Ashcroft, Sweeney. Marshall (Kerr 45), McMullan (McCowan 63) Robertson (McGhee 68) Anderson. Cameron, Mulligan, Thomas (Sheridan 56), Jakubiak (Rudden 63) Subs Not Used: Legzdins.
Referee: Craig Napier
Att: 2,089
