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 scop e of our cyclization-anion capture methodology, is introduced and exemplifi ed by a wide variety of catalytic cyclization-carbonylation-anion capture p rocesses employing hydride, organostannanes and NaBPh4 as anion capture age nts. Mono- and bis-cyclization processes forming 5- and 6-membered rings ar e described, all of which employ CO at atmospheric pressure. Cyclocarboform ylation processes provide interesting analogues of hydroformylation. (C) 20 01 Elsevier Science Ltd. All rights reserved.