.htaccess 301 redirect to new site

I want to redirect some of my old sites to my new sites. Some Googling suggest pasting this into my .htaccess:

redirect 301 / http://new.com/

However, the new site does not have the same structure as the old sites, so it's just pointing to a bunch of 404s. How can I configure my old sites to redirect to the root of my new site, regardless of path? eg:

old.com/foo -> new.com
old.com/bar/foo.html -> new.com
old.com -> new.com

Thank you!