Catalytic synthesis of terpenoid-derived hexahydro-2H-chromenes with analgesic activity over halloysite nanotubes

A. Yu Sidorenko*, Yu M. Kurban, I. V. Il'ina, N. S. Li-Zhulanov, D. V. Korchagina, O. V. Ardashov, J. Wärnå, K. P. Volcho, N. F. Salakhutdinov, D. Yu Murzin, V. E. Agabekov

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

Abstrakti

Condensation of α-pinene derived p-menta-1,8-diene-5,6-diol (diol) with decanal was studied for the first time over modified halloysite nanotubes (HNT). The yield of the desired hexahydro-2H-chromene-4,8-diol with analgesic activity was 76–80 % practically not depending on the catalyst type, while selectivity to 4S-isomer decreased, and to 4R-isomer increased with increasing acidity. The highest selectivity to 4S-diastereomer (48.1 %) on halloysite is a result of weak acidity of this catalyst. DFT optimization of the key intermediate structure shows that the nucleophile attack proceeds at the equatorial position with the 4S-diastereomer formation, which was preferred on halloysite. On strong Brønsted (Amberlyst-15) and Lewis (scandium triflate) acids the target product yield did not exceed 37 % because of dehydration. Halloysite nanocatalysts displayed a stable performance. In the case of diol reaction with a set of carbonyl compounds, the yields of hexahydro-2H-chromene-4,8-diols (up to 88.0%) and the ratio of its 4S/4R isomers (up to 21.0) were significantly higher than on other catalysts.

AlkuperäiskieliEnglanti
Artikkeli118144
JulkaisuApplied Catalysis A: General
Vuosikerta618
DOI - pysyväislinkit
TilaJulkaistu - 25 toukokuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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