Direct Oxidative Carbon−Carbon Bond Formation Using the “Cation Pool” Method. 1. Generation of Iminium Cation Pools and Their Reaction with Carbon Nucleophiles
method that involves the generation of a “cation pool” using low-temperature electrolysis, and then its reaction with nucleophiles under non-oxidative conditions. This one-pot method solves problems associated with conventional oxidative generation of cations and their in situ reaction with nucleophiles, and provides an efficient method for direct oxidative carbon−carbon bond formation. As an example
A combination of TiCl4 and PhSiCl3 efficiently conducts the Mannich-type reaction of N,O-acetals with ketones to afford a-substituted cyclic amine derivatives in good yields. This method was applicable to preparation of azabicyclo compounds by the intramolecular Mannich-type reaction.