Nitrogen is a requirement for the photochemical induced 3-azabicyclo[3.3.1]nonane skeletal rearrangement!

Regioselective and diastereoselective synthesis of two functionalized 1,5-methanoindeno[1,2-d]azocines via a three-component reaction

The morpholine promoted three-component reaction of N-alkylpiperidinone, indane-1,3-dione and 2-arylideneindane-1,3-dione in ethanol at room temperature resulted in the (1H-1,5-methanoindeno[1,2-d]azocin-12-ylidene)-1H-indene-1,3(2H)-dione derivatives in good yields and with exo-configuration.

Facile one-pot synthesis of a 3-azabicyclo[3.3.1]nonane scaffold by a tandem Mannich reaction

Various 3-azabicyclo[3.3.1]nonane derivatives are readily synthesized directly from aromatic ketones, paraformaldehyde and dimethylamine via a novel one-pot tandem Mannich annulation.