Indane Derivative Intermediates for Perfume Synthesis

The patent applies preliminary action by pre-functionalizing the indane derivative with a hydroxymethyl group and ester group in specific positions before the final transformation. This preliminary structuring of the intermediate compound (I) with specific substituents R1 at positions 4, 5, 6, or 7 enables a more direct and efficient conversion to the target perfuming ingredient, avoiding the need for multiple subsequent modification steps required by prior art processes.

The patent employs parameter changes by systematically varying the substituents R1 (which can be hydrogen, alkyl, alkoxy, halogen, or their combinations) on the indane core structure. This parametric approach allows optimization of both the intermediate stability and final product performance, while the systematic variation enables identification of high-yield pathways that improve productivity compared to fixed prior art routes.

The patent achieves universality by designing a platform intermediate (I) with a versatile core structure that can serve multiple synthetic purposes. The indane derivative with hydroxymethyl and ester groups, substituted with various R1 groups, functions as a universal precursor that can be transformed into different perfuming ingredients by simple variation of conditions, eliminating the need for completely different key intermediates required by prior art for different target molecules.

The patent applies the extraction principle by isolating and optimizing the specific functional pattern (hydroxymethyl group at position 2 and ester group at position 1) from the complex prior art synthesis routes. This extracted functional motif becomes the core of intermediate (I), which can then be efficiently converted to target products without carrying forward the unnecessary complexity and multiple steps of the original synthesis pathways.