Hello,
this is kind of general question - what exactly does not work?
It the RewriteCond not matched?
Does the target URL exists?
Is the condition reachable at all? (check rules order in .htaccess)
Is the RewriteCond correct: I beilve it shoud end with ^/boutique-moto/.*, not ^/boutique-moto/*. (but maybe it was just typo in this forum)
...
However, I do not see any relation with JoomSEF here, so you can either study Apache's docs closer or get a
paid Joomla / SEO support from us.