Photochemical Synthesis of 2-Azabicyclo[3.2.0]heptanes: Advanced Building Blocks for Drug Discovery. Synthesis of 2,3-Ethanoproline

Intramolecular photochemical [2 + 2]-cyclization of acetophenone enamides gave 2-azabicyclo [3.2.0]heptanes, advanced building blocks for drug discovery. Synthesis of a conformationally restricted analogue of proline, 2,3-ethanoproline, was performed.