Balou J, Khalilzadeh MA, Zareyee D. An efficient and reusable nano catalyst for the synthesis of benzoxanthene and chromene derivatives.
Sci Rep 2019;
9:3605. [PMID:
30837615 PMCID:
PMC6401364 DOI:
10.1038/s41598-019-40431-x]
[Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 02/14/2019] [Indexed: 11/30/2022] Open
Abstract
Potassium fluoride impregnated on clinoptilolite nanoparticles (KF/CP NPs) was investigated as an efficient solid base catalyst for multicomponent condensation reaction. A broad range of aromatic aldehydes and enolizable compounds were condensed with 2-naphthol or 4-hydroxycumarine. The reaction was carried out under a solvent-free condition to give the corresponding benzoxanthene and pyrano [3,2-c]chromene derivatives in high yields. The low cost and availability of catalyst, novel and green procedure makes this strategy more useful for the preparation of tetrahydrobenzo[a]-xanthene-11-one and pyrano [3,2-c]chromene derivatives.
Collapse