Not sure what season you are in there, but I guess you are northern hemisphere and it is Summer. Cuttings are best taken when the tree is dormant in the winter. It might still be worth a try, but leave it some leaves, if the plant doesn't want them it will drop them itself. Give it a good water to start off, then wait until it dries on the surface before re-watering, some put paper in the bottom of the pot to keep it damp.
If it is your tree you might do better this time of year by layering a low branch. Damage a bit of bark slightly, put some rooting hormone on it, bend it to the ground and bury it shallowly, and then put a brick on top to stop it coming up again.