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Zinc triflate promoted general synthetic protocol for the facile construction of chromenes and pyrimidines bearing N-allyl quinolone nucleus

Vala N. D., Jardosh H. H., Patel M. P.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 47

199--207

A series of 8 derivatives of chromene 5a-h synthesized via one-pot cyclocondensation reaction of N-allyl quinolones, α/β naphthol and malononitrile. And 8 derivatives of pyrimidines 8a-h bearing N-allyl quinolone have been synthesized by N-allyl quinolones, ethylacetoacetate, thiourea/urea in the presence of zinc triflate as less toxic catalyst. This methodology allowed the high conversion of product at room temperature. Titled derivatives were elucidated by FT-IR, 1H NMR, 13C NMR, elemental analysis, and mass spectral data.

Convenient Synthesis of Phosphonate Derivatives of 4-Chloro-2H-chromenes

Modranka R., Ochocki J.

Polish Journal of Chemistry

2004

Vol. 78 / nr 7

943-950

2,4-Dichloro-2H-chromene-3-carboxylates are formed in good yield in the condensation of the appropriate precursors with SOCl2. These derivatives readily react with trialkyl phosphites to produce 2-phosphonate derivatives of 4-chloro-2H-chromene- 3-carboxylates.