Saturated Heterocycles. Part 234. Regioselective Synthesis of 3‐endo‐ Hydroxymethyl‐5‐exo‐phenylbicyclo(2.2.1)heptan‐2‐endo‐amine (V) and Its Transformation into Saturated or Partially Saturated Di‐endo‐fused Heterocycles.