Ruthenium-catalyzed intramolecular hydroamination of aminoalkynes
摘要:
Low-valent ruthenium complexes with a pi -acidic ligand, such as Ru(eta (6)-cot)(dmfm)(2) [cot = 1,3,5-cyclooctatriene, dmfm = dimethyl fumarate] and Ru-3(CO)(12), showed high catalytic activity for the intramolecular hydroamination of aminoalkynes. The reaction is highly regioselective, in which a nitrogen atom is selectively attached to an internal carbon of alkynes to give five-, six-, and seven-membered nitrogen heterocycles as well as indoles in good to high yields. (C) 2001 Elsevier Science B.V. All rights reserved.
Facile one-pot synthesis of 2,3-dihydro-1H-indolizinium derivatives by rhodium(<scp>iii</scp>)-catalyzed intramolecular oxidative annulation via C–H activation: application to ficuseptine synthesis
Various substituted indolizidinium, quinolizinium and pyrido[1,2-a]azepinium salts were synthesized from benzaldehydes (α,β-unsaturated aldehydes) and alkyne–amines via Rh-catalyzed C–H activation.