The markup surrounding the content is not specified by WordPress, so there is no hook for that.
But you can declare your own hook there. In your template file, write …
<?php
do_action( 'before_content_container' );
?>
<div class="main">
<?php
the_content();
?>
</div>
<?php
do_action( 'after_content_container' );
?>
… and then you can register a callback for that action in your functions.php.
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