Script to force quit all open applications not working get syntax error

If I put the following in Terminal

kill $(osascript -e 'tell app "System Events" to unix id of processes where background only is false'|tr -d ,)

it kills every running process.

If I put it in an Apple script, it does not work.  

Example:

tell application "Terminal"
            do script "kill $(osascript -e 'tell app "System Events" to unix id of processes where background only is false'|tr -d ,)"
end tell

or 

do shell script "kill $(osascript -e 'tell app "System Events" to unix id of processes where background only is false'|tr -d ,)"

I get an syntax error stating: A identifier can’t go after this “"”.

Flagging "System.

What do I do wrong?