$thedata = array();
foreach ( $artikel->attributes->attribute as $property ) {
    $attribute_name = 'pa_' .sanitize_title_with_dashes($property->attributes()->name);
    $attribute_value = $property->attributes()->value;

    wp_set_object_terms( $insertProduct, (string)$attribute_value, $attribute_name , true);

    $thedata[$attribute_name] = array(
        'name'=> $attribute_name,
        'value'=> (string)$attribute_value,
        'is_visible' => '1',
        'is_variation' => '1',
        'is_taxonomy' => '1'
    );
}
update_post_meta( $insertProduct,'_product_attributes', $thedata) ;