Woocommerce product info in a sidebar?

Checkout the content-single-product.php WooCommerce template for an idea of what functions are hooked where. It is very well commented. When you learn about hooks and filters, all these questions start to become similar.

You’ll want to remove the function from it’s current hook and add it to a new hook. This sample includes a fake hook destination because I don’t know what theme you are using and all themes are different. This is for your functions.php or your child theme’s functions.php:

function wpa116854_move_product_excerpt(){
    remove_acton( 'woocommerce_single_product_summary', 'woocommerce_template_single_excerpt', 20 );
    if(function_exists('woocommerce_template_single_excerpt'))
         add_action( 'your_theme_some_hook', 'woocommerce_template_single_excerpt' );
}
add_action( 'woocommerce_before_single_product', 'wpa116854_move_product_excerpt' );

Replace your_theme_some_hook with the appropriate hook. Or you can add the woocommerce_template_single_excerpt() function directly to your sidebar.php file.

if(function_exists('woocommerce_template_single_excerpt'))
    woocommerce_template_single_excerpt();

Something I wrote a while ago to explain how to manipulate WordPress functions and action hooks.