Jump to main content
Jump to site search

Issue 10, 2012
Previous Article Next Article

Design and synthesis of benzylpyrazolyl coumarin derivatives via a four-component reaction in water: investigation of the weak interactions accumulating in the crystal structure of a signified compound

Author affiliations

Abstract

A combinatorial library of benzylpyrazolyl coumarin derivatives have been synthesized by a green one-pot four-component reaction between aryl hydrazine/hydrazine hydrate (1), ethyl acetoacetate (2), aromatic aldehydes (3) and 4-hydroxycoumarin (4). Molecular scaffolds which assimilate bio-active 3-benzylsubstituted 4-hydroxycoumarins as well as a pyrazolone ring in a single nucleus may be worthwhile molecules from a biological point of view. The reactions were performed in water and employed glacial acetic acid as the right choice of catalyst, and was demonstrated to be the key for rendering the reaction possible and obtained good to excellent yields under reflux conditions within a short period of time. The crystal structures of (R/S)-benzylpyrazolyl coumarin, easily produced by a chromatography-free highly product-selective reaction, were explored by means of single crystal X-ray diffraction analysis and the main intra- and intermolecular interactions perceivable through crystal structure analysis. The presence of a strong intramolecular hydrogen bond was confirmed. In addition, the whole crystal structure consists of other intermolecular hydrogen bonds, such as CH⋯O and aromatic CH⋯π interactions between R- and S-molecules and CH⋯O, NH⋯O and aromatic CH⋯π interactions among only R-molecules and S-molecules in the asymmetric unit.

Graphical abstract: Design and synthesis of benzylpyrazolyl coumarin derivatives via a four-component reaction in water: investigation of the weak interactions accumulating in the crystal structure of a signified compound

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 03 Jul 2012, accepted on 06 Aug 2012 and first published on 07 Aug 2012


Article type: Communication
DOI: 10.1039/C2GC36021G
Citation: Green Chem., 2012,14, 2691-2698
  •   Request permissions

    Design and synthesis of benzylpyrazolyl coumarin derivatives via a four-component reaction in water: investigation of the weak interactions accumulating in the crystal structure of a signified compound

    P. P. Ghosh, G. Pal, S. Paul and A. R. Das, Green Chem., 2012, 14, 2691
    DOI: 10.1039/C2GC36021G

Search articles by author