But they had Jon McCracken to thank when he dived and made a great save from Murray's spot kick. At least it made Dundee get back into the game and they had several chances in the first half.
Luke McCowan was denied twice by McAdams in the Arbroath goal who pulled off a couple of great saves. Antonio Portales was unlucky when his header came back of the post.
Just before half time McCracken had to save well again from Murray and then at the other end Main beat the keeper but his effort was cleared off the line.
Sylla went close from a corner at the start of the second half but his looping header dropped just over the bar. Dundee were in control and went 1-0 up when Tiffiney was fouled in the box. Luke McCowan stepped up to score with ease.
Cameron and Robertson had shots blocked as Dundee went in to kill the game with a second goal, Arbroath did hve a wee spell on attack and forced a few corners but never troubled the dark blues defence.
The Dark Blues soon reasserted control and three substitutions gave them fresh impetus. Seb Palmer-Houlden, Josh Mulligan and Simon Murray came on for Curtis Main, Lyall Cameron and Scott Tiffoney.
After 78 minutes it was 2-0 Murray had a shot saved but it fell to Ethan Ingram who smashed the ball home to seal the three points.
Dundee saw the rest of the game out with out adding to the final scoreline. Another vital win which puts them top in the group.
Dundee: McCracken, Astley, McGhee, Portales, Sylla, Ingram, McCowan (c), Cameron (Mulligan 72), Fin Robertson, Main (Palmer-Houlden 61), Tiffoney (Murray 72). Unused Subs : Carson (gk), Sharp (gk), Anderson, Graham, Richardson, Lochhead.
Referee: Chris Graham.
Att: 1,776
