Catalytic annulation of 1-substituted-3-en-1-yn-5-als with cycloalkanones using acid–base dual catalysts
摘要:
CpRu(PPh3)(2)Cl and DBU dual catalysts in combination enable a one-pot annulation of I -R-3-en-l-yn-5-als (R = aryl, alkenyl, alkyl) and cycloalkanones to give highly substituted benzene products. This catalytic reaction consists ora tandem aldol condensation, dehydration and aromatization through a 1,7-hydrogen shift; the resulting 1-indanones and alpha-tetralones are obtained in moderate to good yields. (c) 2007 Elsevier Ltd. All rights reserved.