Palladium catalysed queuing processes. Part 1: Termolecular cyclization-anion capture employing carbon monoxide as a relay switch and hydride, organotin(IV) or boron reagents

The concept of relay switch reactants, which substantially enhance the scope of our cyclization-anion capture methodology, is introduced and exemplified by a wide variety of catalytic cyclization-carbonylation-anion capture processes employing hydride, organostannanes and NaBPh4 as anion capture agents. Mono- and bis-cyclization processes forming 5- and 6-membered rings are described, all of which employ CO at atmospheric pressure. Cyclocarboformylation processes provide interesting analogues of hydroformylation. (C) 2001 Elsevier Science Ltd. All rights reserved.