Synthesis 2021; 53(21): 4020-4029
DOI: 10.1055/a-1526-7917
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Oxygen-Tethered 1,6-Enynes and [4.1.0]-Bicyclic Ether Skeletons as Hedonic Materials for the Fragrance Industry

Romain Laher
a   Institut de Chimie de Nice, University Côte d’Azur, UMR 7272 CNRS, Valrose Park, Faculty of Sciences, Nice 06108 CEDEX 2, France
,
Emilie Gentilini
a   Institut de Chimie de Nice, University Côte d’Azur, UMR 7272 CNRS, Valrose Park, Faculty of Sciences, Nice 06108 CEDEX 2, France
,
Christophe Marin
b   Expressions Parfumées, 136 chemin de St Marc, Grasse 06130, France
,
a   Institut de Chimie de Nice, University Côte d’Azur, UMR 7272 CNRS, Valrose Park, Faculty of Sciences, Nice 06108 CEDEX 2, France
› Author Affiliations
This work was supported by the Centre National de la Recherche Scientifique (CNRS) and the University Côte d’Azur. We gratefully acknowledge Expressions Parfumées for a grant to R.L.. This study was partly supported by research funding from the Canceropôle PACA, Institut National du Cancer, and Région Sud.


Abstract

The synthesis of original structures for the fragrance industry bearing bicyclic scaffolds is described. To the best of our knowledge, these structures are not found in the fragrance industry, neither from natural nor synthetic pathways. NHC–gold-type catalysts showed excellent activities leading to light bicyclic enol ethers. Several bicyclic adducts were prepared in good to excellent yields (18–99%). Evaluation of NHC–Au complexes allowed to reach a TOF of 300 h–1. The evaluation for the organoleptic properties of [4.1.0]-bicyclic ethers were compared with the unprecedented properties of the 1,6-enyne precursors. Evaluations of starting materials showed a great interest in these structures with various olfactory facets. In this study, we depicted the similarity and differences between starting ethers and their cycloisomerized bicyclic counterparts.

Supporting Information



Publication History

Received: 12 May 2021

Accepted after revision: 10 June 2021

Accepted Manuscript online:
10 June 2021

Article published online:
29 July 2021

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