Synthesis and stereochemistry of β-aryl-β-haloacroleins: useful intermediates for the preparation of (Z ) and (E )-2-en-4-ynecarbaldehydes and for the synthesis of rubrolides
作者:Damien Prim、Alexia Fuss、Gilbert Kirsch、Artur M. S. Silva
DOI:10.1039/a900286c
日期:——
The synthesis of α-substituted β-aryl-β-haloacroleins by two different pathways is presented. The determination of their stereochemistry by NOE experiments is reported for the first time. Furthermore, we describe the preparation of 2-en-4-ynecarbaldehydes and access to rubrolide derivatives from β-aryl-β-haloacroleins.
Catalytic annulation of 1-substituted-3-en-1-yn-5-als with cycloalkanones using acid–base dual catalysts
作者:Chia-Wei Yang、Rai-Shung Liu
DOI:10.1016/j.tetlet.2007.06.045
日期:2007.8
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.