1. Synthetic route to 6-functionalized 2-azabicyclo[3.3.1]nonanes
2. Synthesis of 2-Azabicyclo[3.3.1]nonanes
3. C-Acylations of keto acids with arenesulfonic acids (6), polyphosphoric acid (7), aluminum trichloride-propionyl chloride (8), boron trifluoride etherate-glacial acetic acid-acetic anhydride (9), and acetic anhydride-sodium acetate (10), have been carried out. These procedures have been occasionally used in the preparation of non-enolizable β-diketones.
4. J. A. Findlay, W. A. Henry, T. C. Jain, Z. Valenta, K. Wiesner and C. M. Wong, Tetrahedron Letters, 689 (1962);