Multisite root 301 redirect to subdirectory

Hi, I am trying to figure out how to perfrom an .htaccess 301 redirect on an installation of a multi wordpress site.

I would like to have:
blog.domain.com/ redirect to: blog.domain.com/site1

Anytime I try putting a redirect in the .htaccess file, I get all sorts of server errors, and loops. Anyone have any suggestions? I can’t be the only person seeking to do such.

# BEGIN WordPress
RewriteEngine On
RewriteBase /blog.domain.com/
RewriteRule ^index\.php$ - [L]

Redirect 301 /index.php /mysite

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

# END WordPress