Search Engine returning multiple 404s, Redirect 404 urls based on node id in the url
Try 

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^articles/.*/.*/(.*)$ /node/$1 [R=301,L]


of not worked use your absolute URL

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^articles/.*/.*/(.*)$ http://www.yourdomin.com/node/$1 [R=301,L]