Flipping a molecule vs. mirror behind compound
If you place a mirror behind the compound and look into the mirror,
  you get the second drawing


"If you place a mirror behind compound 1 and look into the mirror" - If by that you mean, generate the mirror image of compound 1, well OK, but that does not produce compound 2. It generates the molecule labeled "mirror image" in the following diagram, and it is a non-superimposable mirror image.