The Blues trade was the only one that fits with a big caveat that he was a pending UFA, whereas Woll isn't. The other moves were all made in the summer with a full off-season to make necessary adjustments. So as I said, basically never happens. None of them traded a good player/goaltender locked up for a prospect IN SEASON for no reason other than to grab a prospect minimum a year away from any sort of impact, likely more than a year. Leafs don't have cap space issues anymore and certainly don't have the luxury of dumping a good goaltender.
Next off-season Leafs could very well look to trade Woll, or Stolarz, for a prospect/picks and then fill out their depth accordingly via free agency or other avenues. There's a time to make a trade for the future, right now though the goal is probably trying to win hockey games.