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Letters in Organic Chemistry


ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

Research Article

Iodine-Mediated Aromatization of Himachalenes: Synthesis of Dehydro-7,8-arylhimachalene

Author(s): Isam Louchachha*, Youssef Edder, Abdelmajid Faris, Brahim Boualy, Mustapha Ait Ali and Abdallah Karim

Volume 21, Issue 12, 2024

Published on: 16 April, 2024

Page: [1049 - 1054] Pages: 6

DOI: 10.2174/0115701786297846240408070836

Price: $65


Dehydro-7,8-aryl-himachalene is a desired natural benzocycloheptene sesquiterpene found in the essential oil of Atlas cedar (Cedrus atlantica) in minor quantities. Herein, we report a simple and environmentally benign synthesis of this molecule via the aromatization of himachalene mixture (the major constituent of the same oil).

The synthesis of the desired compound has been achieved by iodine/DMSO-mediated aromatization. The synthesized product has been characterized using MS spectrometry and NMR spectroscopy data.

The treatment of the himachalene mixture with iodine led to the formation of dehydro-7,8-arylhimachalene, along with other rearrangement products catalyzed by the hydroiodic acid formedin situ. The use of DMSO as a co-solvent enabled the elimination of the acid formed and the regeneration of iodine. The optimization of the reaction conditions led to the formation of the desired product with a good yield.

The present study highlights the development of a simple and environmentally benign method for the synthesis of a natural benzocycloheptene-based sesquiterpenoid in large quantities in order to explore its biological and chemical properties.

Keywords: Sesquiterpene, dehydro-7, 8-arylhimachalene, iodine-mediated aromatization, natural products, benzocycloheptene, himachalene, cedar oil.

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