Prins cyclization of (-)-isopulegol with benzaldehyde for production of chromenols over organosulfonic clays

Nikolai Li-Zhulanov, Päivi Mäki-Arvela, Mathias Laluc, Andreia F. Peixoto, Ekaterina Kholkina, Thomas Sandberg, Atte Aho, Konstantin Volcho, Nariman Salakhutdinov, Cristina Freire, Alexander Yu Sidorenko, Dmitry Yu Murzin

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Prins cyclization of (-)-isopulegol with benzaldehyde was investigated with sulphur containing halloysite nanotubes, K10 clays and Cloisite clays. The catalysts were characterized by TEM, SEM, XRD, XPS, pyridine adsorption desorption by FTIR, nitrogen adsorption. The most active catalyst was K10 modified with chlorosulphonic acid giving 95% selectivity to the desired chromenol at 90% conversion and 30 °C. Selectivity to chromenol was increasing with increasing Lewis acid site concentration while no linear correlation of chromenol selectivity with the Brønsted acid sites concentration was observed. The diastereoisomer R/S ratio of chromenols was the highest, 11.5, at 70 °C and 90% conversion over sulphur modified halloysite nanotubes exhibiting rather low acidity. A higher stability of the R-isomer confirmed by quantum mechanical calculations can partially explain preferential formation of the R diastereomer. Successful catalyst reuse was demonstrated with the best performing catalyst, organosilylated sulphur containing K10.

Original languageEnglish
Article number110569
Number of pages12
JournalMolecular Catalysis
Volume478
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Chromenols
  • Isopulegol
  • Organosulfonic clays
  • Prins reaction
  • ACID
  • OCTAHYDRO-2H-CHROMEN-4-OL
  • ESTERIFICATION
  • ISOPULEGOL
  • ANALGESIC ACTIVITY
  • MECHANICAL-PROPERTIES
  • NANOCOMPOSITES
  • MODIFIED HALLOYSITE NANOTUBES
  • ABSORPTION
  • CATALYSTS

Fingerprint Dive into the research topics of 'Prins cyclization of (-)-isopulegol with benzaldehyde for production of chromenols over organosulfonic clays'. Together they form a unique fingerprint.

Cite this